{"product_id":"ngk-4853-pfr7b-double-platinum-spark-plug-box-of-4-audi-s4-s6-bmw-alpina-b7","title":"NGK 4853 PFR7B Double Platinum Spark Plug Box of 4 Audi S4 S6 BMW Alpina B7","description":"\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 1: OPENING PARAGRAPH                                 --\u003e\u003c!-- ============================================================ --\u003e\n\u003cp\u003eThe \u003cstrong\u003eNGK 4853 PFR7B Double Platinum Spark Plug\u003c\/strong\u003e is a laser-welded, fine-wire platinum plug engineered for the \u003cstrong\u003e1991 Audi 200, 1992-1994 Audi S4, 1995-1997 Audi S6, 1997 Volvo 850, and 2007-2008 BMW Alpina B7\u003c\/strong\u003e. Running an M14 x 1.25 thread, 19mm reach, and a factory pre-set gap of 0.028 in (0.7mm), 4853 delivers platinum-grade ignition reliability rated to 70,000-90,000 miles. Heat range 7 makes this plug one step colder than the standard OEM PFR6B, making it the correct choice for modified or higher-output versions of these engines. Each order of 4853 includes four plugs with pre-installed crush washers. Made in Japan.\u003c\/p\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 2: DOUBLE PLATINUM TECHNOLOGY                        --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eDouble Platinum Technology\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLaser-welded dual platinum electrodes:\u003c\/strong\u003e A fine-wire 1.0mm platinum center electrode and a platinum-tipped ground electrode work together to maintain a stable spark gap over the full service life, reducing the wear-driven misfire that plagues conventional nickel plugs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e98% pure copper core:\u003c\/strong\u003e The copper core dissipates combustion heat faster than nickel alloy cores, keeping electrode temperature in the optimal ignition zone and preventing pre-ignition under boost or high-load driving.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePure alumina silicate ceramic insulator:\u003c\/strong\u003e Rated for superior dielectric strength, the insulator resists thermal shock, prevents flashover via corrugated ribs, and transfers heat efficiently away from the firing tip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrivalent metal plating on the shell:\u003c\/strong\u003e A triple-layer anti-corrosion and anti-seize coating makes installation and future removal cleaner, even after years of heat cycling in aluminum cylinder heads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold-rolled threads:\u003c\/strong\u003e Cold rolling work-hardens the thread form, reducing the chance of thread cross-threading or galling during installation in aluminum heads common on Audi, Volvo, and BMW platforms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple seals:\u003c\/strong\u003e Three-stage sealing between the insulator and shell prevents combustion gases from leaking past the plug body, protecting the ignition system and maintaining cylinder pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMid-projection firing tip:\u003c\/strong\u003e The 3.5mm projected platinum tip reaches deeper into the combustion chamber for faster flame kernel propagation, cleaner combustion, and better cold-start behavior.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5k Ohm resistor built in:\u003c\/strong\u003e The integrated 5,000-Ohm resistor suppresses ignition noise, protecting sensitive OBD-II electronics and eliminating RF interference in modern engine management systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 3: HEAT RANGE EXPLANATION + COMPARISON TABLE         --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eHeat Range 7 vs. Heat Range 6 Which Plug Do You Need?\u003c\/h4\u003e\n\u003cp\u003eNGK's heat range numbering works on a simple scale: \u003cstrong\u003ehigher number = colder plug\u003c\/strong\u003e. A colder plug transfers combustion heat away from the firing tip faster, which protects against pre-ignition and tip erosion in high-output or modified engines. A hotter plug retains more heat to self-clean fouling in stock, lower-load applications.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e4853 (PFR7B, Heat Range 7)\u003c\/strong\u003e sits one step colder than the \u003cstrong\u003ePFR6B (Stock 3500, Heat Range 6)\u003c\/strong\u003e, which is the OEM heat range for most naturally aspirated and stock-turbocharged applications in this plug family. If your Audi S4, S6, or 200 Quattro is chipped, running a tune, or otherwise making more power than factory spec, 4853 is the correct selection. For a completely stock engine, the PFR6B (Stock 3500) is the OEM-equivalent choice.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eNGK4853 (PFR7B)\u003c\/th\u003e\n\u003cth\u003eNGK Stock 3500 (PFR6B)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNGK Stock Number\u003c\/td\u003e\n\u003ctd\u003e4853\u003c\/td\u003e\n\u003ctd\u003e3500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNGK Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003ePFR7B\u003c\/td\u003e\n\u003ctd\u003ePFR6B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Range\u003c\/td\u003e\n\u003ctd\u003e7 (one step colder)\u003c\/td\u003e\n\u003ctd\u003e6 (OEM \/ stock)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest Application\u003c\/td\u003e\n\u003ctd\u003eModified, chipped, or high-boost engines\u003c\/td\u003e\n\u003ctd\u003eStock \/ naturally aspirated engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM14 x 1.25\u003c\/td\u003e\n\u003ctd\u003eM14 x 1.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReach\u003c\/td\u003e\n\u003ctd\u003e19mm\u003c\/td\u003e\n\u003ctd\u003e19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGap\u003c\/td\u003e\n\u003ctd\u003e0.028 in (0.7mm)\u003c\/td\u003e\n\u003ctd\u003e0.028 in (0.7mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrode Type\u003c\/td\u003e\n\u003ctd\u003eDouble Platinum (Laser)\u003c\/td\u003e\n\u003ctd\u003eDouble Platinum (Laser)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResistor\u003c\/td\u003e\n\u003ctd\u003e5k Ohm\u003c\/td\u003e\n\u003ctd\u003e5k Ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 4: WHAT'S INCLUDED                                   --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eWhat's Included with 4853\u003c\/h4\u003e\n\u003cp\u003eEach 4853 order ships as a \u003cstrong\u003ebox of 4 plugs\u003c\/strong\u003e enough for a complete service on all five-cylinder Audi and Volvo applications listed in the fitment table. The BMW Alpina B7 4.4L V8 requires two boxes (8 plugs total) for a full engine set.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4 x NGK PFR7B (Stock No. 4853) Laser Platinum spark plugs\u003c\/li\u003e\n\u003cli\u003e4 x Pre-installed crush washers (one per plug, gasket seat)\u003c\/li\u003e\n\u003cli\u003ePlugs are factory pre-gapped at 0.028 in (0.7mm) do not regap the platinum center electrode\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 5: FITMENT TABLE                                      --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eVehicle Fitment 4853 (PFR7B)\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003e4853\u003c\/strong\u003e fits the vehicles listed below. Confirm your exact year, engine displacement, and trim level before ordering. The Audi 200 Quattro fitment covers both the standard 20v and 20v Avant body styles. The 1997 Audi S6 fitment applies to the 2.2L L5 only; the V8 S6 uses a different plug. The 2007-2008 BMW Alpina B7 requires two boxes of NGK4853 for a full eight-plug service.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eTrim \/ Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1991\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003e200 Quattro\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003e20v\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1991\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003e200 Quattro\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003e20v Avant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1992\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS4\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1993\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS4\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1994\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS4\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1995\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS6\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1995\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS6\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003eAvant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS6\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1997\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS6\u003c\/td\u003e\n\u003ctd\u003e2.2L L5\u003c\/td\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1997\u003c\/td\u003e\n\u003ctd\u003eVolvo\u003c\/td\u003e\n\u003ctd\u003e850\u003c\/td\u003e\n\u003ctd\u003e2.3L L5\u003c\/td\u003e\n\u003ctd\u003eAll trims\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2007\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eAlpina B7\u003c\/td\u003e\n\u003ctd\u003e4.4L V8\u003c\/td\u003e\n\u003ctd\u003eBase (requires 2 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2008\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eAlpina B7\u003c\/td\u003e\n\u003ctd\u003e4.4L V8\u003c\/td\u003e\n\u003ctd\u003eBase (requires 2 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 6: FULL SPECIFICATIONS TABLE                         --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eFull Specifications 4853 (PFR7B)\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eNGK4853\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNGK Part Number (MPN)\u003c\/td\u003e\n\u003ctd\u003ePFR7B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNGK Stock Number\u003c\/td\u003e\n\u003ctd\u003e4853\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e087295148532\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlug Type\u003c\/td\u003e\n\u003ctd\u003eDouble Platinum (Laser Platinum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Size\u003c\/td\u003e\n\u003ctd\u003eM14 x 1.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReach\u003c\/td\u003e\n\u003ctd\u003e19mm (0.750 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat Type\u003c\/td\u003e\n\u003ctd\u003eGasket (flat \/ crush washer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHex Size\u003c\/td\u003e\n\u003ctd\u003e5\/8 in (16mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePre-Set Gap\u003c\/td\u003e\n\u003ctd\u003e0.028 in (0.7mm) -- do not adjust\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Range\u003c\/td\u003e\n\u003ctd\u003e7 (one step colder than OEM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResistor\u003c\/td\u003e\n\u003ctd\u003eYes -- 5,000 Ohm (5k Ohm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Electrode\u003c\/td\u003e\n\u003ctd\u003ePlatinum, fine wire, 1.0mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Electrode Core\u003c\/td\u003e\n\u003ctd\u003e98% pure copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGround Electrode\u003c\/td\u003e\n\u003ctd\u003ePlatinum tip, nickel core, standard J-gap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTip Projection\u003c\/td\u003e\n\u003ctd\u003eMid-projection, 3.5mm (0.14 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulator Material\u003c\/td\u003e\n\u003ctd\u003ePure alumina silicate ceramic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulator Height\u003c\/td\u003e\n\u003ctd\u003e50.5mm (1.99 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Type\u003c\/td\u003e\n\u003ctd\u003eSolid \/ non-removable (fixed SAE)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Quantity\u003c\/td\u003e\n\u003ctd\u003e4 plugs per box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eService Life\u003c\/td\u003e\n\u003ctd\u003e70,000 to 90,000 miles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e60-day NGK limited warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 7: OEM CROSS-REFERENCE TABLE                         --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eOEM and Aftermarket Cross-Reference\u003c\/h4\u003e\n\u003cp\u003eThe 4853 (PFR7B) replaces or cross-references the following OEM and aftermarket part numbers. Always verify fitment by year, make, model, and engine before ordering cross-reference numbers confirm dimensional compatibility but do not substitute for a fitment check.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand \/ OEM\u003c\/th\u003e\n\u003cth\u003eCross-Reference Part Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNGK (this plug)\u003c\/td\u003e\n\u003ctd\u003ePFR7B \/ Stock 4853\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBosch\u003c\/td\u003e\n\u003ctd\u003eF5DP0R (also listed as F5DPOR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDenso\u003c\/td\u003e\n\u003ctd\u003e3273 \/ 3265 \/ PK22PR8 \/ PK22PR11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBeck\/Arnley\u003c\/td\u003e\n\u003ctd\u003e1765303\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChampion\u003c\/td\u003e\n\u003ctd\u003eRC78PYP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutolite\u003c\/td\u003e\n\u003ctd\u003eAP3922\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotorcraft\u003c\/td\u003e\n\u003ctd\u003eAGPR12PP8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi \/ VW \/ Skoda \/ Seat\u003c\/td\u003e\n\u003ctd\u003e101 000 016 AA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi \/ VW \/ Skoda \/ Seat\u003c\/td\u003e\n\u003ctd\u003e101 905 611 C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW \/ Alpina\u003c\/td\u003e\n\u003ctd\u003e12 12 0 035 747\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003e22401-AA360\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNissan \/ Infiniti\u003c\/td\u003e\n\u003ctd\u003e22401-53V17\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 8: WARRANTY + PROP 65                                --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eWarranty and Legal Information\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e NGK 4853 is covered by NGK's 60-day limited warranty against defects in materials and workmanship. Service life is rated at 70,000 to 90,000 miles under normal operating conditions. The warranty period begins at the date of purchase and covers manufacturing defects only it does not cover damage from improper installation, gap adjustment on platinum\/iridium electrodes, or use outside the confirmed fitment applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMagnuson-Moss Warranty Act:\u003c\/strong\u003e Installing 4853 in a vehicle it is confirmed to fit will not void your factory powertrain warranty. Under the federal Magnuson-Moss Warranty Act, a vehicle manufacturer cannot void your factory warranty solely because you installed an aftermarket part. They must demonstrate the aftermarket part directly caused the failure being claimed before denying coverage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCalifornia Residents Proposition 65 Warning:\u003c\/strong\u003e This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit \u003ca href=\"http:\/\/www.p65warnings.ca.gov\"\u003ewww.p65warnings.ca.gov\u003c\/a\u003e.\u003c\/p\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 9: ABOUT NGK                                         --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eAbout NGK Spark Plugs\u003c\/h4\u003e\n\u003cp\u003eNGK Spark Plugs was founded in Nagoya, Japan in 1936 and has grown into the world's largest manufacturer of spark plugs and ceramic insulators. NGK supplies spark plugs as original equipment to virtually every major automaker on the planet, including Audi, BMW, Toyota, Honda, Subaru, Nissan, and Volvo. The Laser Platinum and Iridium IX series represent NGK's premium aftermarket lines, applying OEM-grade manufacturing processes including laser-welded electrode bonding and precision gap setting to plugs sold in the aftermarket. Every NGK plug is manufactured and tested to ISO 9001 standards at NGK's own facilities. The 4853 (PFR7B) is produced at NGK's Japanese manufacturing operations, which is reflected in the Japan country of origin designation.\u003c\/p\u003e\n\u003c!-- ============================================================ --\u003e\u003c!-- SECTION 10: FAQ                                              --\u003e\u003c!-- ============================================================ --\u003e\n\u003ch4\u003eFrequently Asked Questions 4853 (PFR7B)\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eShould I adjust the gap on before installing?\u003c\/strong\u003e\u003cbr\u003eNo. 4853 arrives factory pre-gapped at 0.028 in (0.7mm) and should be installed as-is. Do not attempt to re-gap platinum or iridium spark plugs. The fine-wire platinum center electrode is brittle compared to nickel bending or prying the ground electrode to change the gap risks cracking the platinum tip or fracturing the insulator. If your application requires a different gap, select the correct plug for that specification rather than attempting to adjust 4853.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know is already pre-gapped?\u003c\/strong\u003e\u003cbr\u003eNGK sets the gap at the factory on every Laser Platinum plug before it leaves the production line. The 0.028 in (0.7mm) gap on 4853 (PFR7B) is confirmed on the NGK product page and in NGK's published specifications. You can verify the gap with a feeler gauge without touching the electrode checking is fine, adjusting is not.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does heat range 7 mean, and why is 4853 one step colder than OEM?\u003c\/strong\u003e\u003cbr\u003eIn NGK's numbering system, higher numbers indicate a colder heat range. A colder plug has a shorter insulator nose that conducts heat away from the firing tip faster, keeping electrode temperature lower under high-load conditions. 4853 at heat range 7 is one step colder than the PFR6B (stock 3500, heat range 6), which is the OEM plug for most stock applications in this plug family. The colder range of 4853 makes it the correct choice for chipped, tuned, or otherwise modified engines that produce more combustion heat than a stock unit. On a completely unmodified, stock engine, the PFR6B (Stock 3500) is the more appropriate selection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many plugs come in one box?\u003c\/strong\u003e\u003cbr\u003eEach 4853 listing ships as a box of 4 plugs. This is a complete set for any five-cylinder engine in the fitment list (Audi 200 Quattro 2.2L L5, Audi S4 2.2L L5, Audi S6 2.2L L5, Volvo 850 2.3L L5). The 2007-2008 BMW Alpina B7 4.4L V8 uses eight plugs; you will need to order two boxes of 4853 for a full engine service on that application.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy buy the 4-pack of 4853 instead of buying single plugs?\u003c\/strong\u003e\u003cbr\u003eSpark plugs should always be replaced as a complete set never one or two at a time. Mixing plugs of different ages, wear levels, or even different heat ranges creates imbalanced cylinder-to-cylinder combustion timing that the ECU cannot fully compensate for. The 4853 four-pack is priced for a complete L5 engine service and eliminates the risk of mismatched ignition performance. Buying singles and assembling your own set costs more and introduces variables the 4-pack avoids entirely.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill installing NGK void my factory warranty?\u003c\/strong\u003e\u003cbr\u003eNo. Under the federal Magnuson-Moss Warranty Act, installing an OEM-equivalent or OE-quality aftermarket spark plug does not void your factory powertrain warranty. A dealer or manufacturer must demonstrate that the aftermarket part directly caused the specific failure being claimed before they can deny warranty coverage. NGK is an OEM supplier to the same automakers whose vehicles are listed in the 4853 fitment table using NGK 4853 is not a modification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes require a Proposition 65 warning in California?\u003c\/strong\u003e\u003cbr\u003eYes. As a precautionary measure based on the materials present in spark plugs (including metals such as lead, nickel, and platinum compounds), 4853 carries a California Proposition 65 warning. California residents should be aware this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. See www.p65warnings.ca.gov for full information.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the recommended service interval?\u003c\/strong\u003e\u003cbr\u003eNGK rates the PFR7B (4853) for a service life of 70,000 to 90,000 miles under normal operating conditions. That said, vehicles with higher output, forced induction, or aggressive tunes may benefit from inspection at 50,000-60,000 miles. Always follow your vehicle manufacturer's scheduled maintenance interval as the minimum baseline, and replace the full set of four plugs at each service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between Double Platinum and Iridium spark plugs?\u003c\/strong\u003e\u003cbr\u003eBoth designs use fine-wire precious-metal electrodes to maintain a stable gap and resist erosion over a long service life. Double platinum plugs like 4853 use a platinum center electrode and a platinum-tipped ground electrode excellent long-term wear resistance at a lower cost than iridium. Iridium plugs use a harder, higher-melting-point metal for the center electrode, which allows an even finer wire diameter and marginally lower required ignition voltage. For the Audi 200, S4, S6, Volvo 850, and BMW Alpina B7 applications listed, 4853 is the confirmed OEM-grade fitment. If an NGK iridium equivalent exists for your specific application and tune level, it would be listed separately under a different part number.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs 4853 the same as PFR7B?\u003c\/strong\u003e\u003cbr\u003eYes. NGK uses two parallel numbering systems: an alphanumeric part number (PFR7B) and a numeric stock number (4853). 4853 is the SKU formed by combining the brand name with the stock number both refer to the identical plug. When cross-referencing or ordering from a distributor, either PFR7B or 4853 will identify the same product. The full name as listed by NGK is the Laser Platinum Spark Plug PFR7B, Stock Number 4853.\u003c\/p\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":45944312332367,"sku":"NGK4853","price":55.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/ngk-4853-pfr7b-double-platinum-spark-plug-4-pack.png?v=1782165325","url":"https:\/\/www.blackopsautoworks.com\/products\/ngk-4853-pfr7b-double-platinum-spark-plug-box-of-4-audi-s4-s6-bmw-alpina-b7","provider":"Black Ops Auto Works","version":"1.0","type":"link"}