-8%
Click to zoom in
SKU: PI-1186 | UPC: 847839000760
Koyo Radiator Drain Plug for BMW 3 Series E36 1992-1999 and 5 Series E39 1997-2003 PI-1186
The Koyo Radiator Drain Plug PI-1186 replaces fragile OEM plastic plugs in BMW E36 3 Series 1992-1999 and E39 5 Series 1997-2003 models including Z3 variants. Built from billet aluminum this plug endures extreme track pressures and heat while enabling fast mess-free coolant drains during maintenance. Its robust construction ensures radiator integrity for street driving or racing demands.
Key Features
- Billet Aluminum Construction: Resists corrosion and cracking far better than stock plastic for long-term radiator protection
- M14x1.5 Thread Pitch: Ensures precise fit into factory radiator ports without modifications
- Viton O-Ring Seal: Provides a tight leak-proof barrier against coolant loss even under vibration
- Quarter-Turn Design: Allows fast partial or full draining without tools for convenient service intervals
- Performance Engineered: Handles demands of modified engines and racing conditions with consistent reliability
Product Notes
- Direct bolt-on replacement for OEM part numbers on specified BMW models
- Compatible with all coolant types including water wetter mixes
- Compact design ships in protective packaging to prevent damage
Installation Notes
- Professional installation recommended.
- Drain existing coolant fully before removing old plug to avoid spills
- Torque to 8-10 Nm using OEM radiator hardware no additional parts needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1992-1995 | BMW | 3 Series | 318i E36 |
| 1992-1995 | BMW | 3 Series | 318is E36 |
| 1995-1999 | BMW | 3 Series | 318ti E36 |
| 1992-1999 | BMW | 3 Series | 325i E36 |
| 1992-1999 | BMW | 3 Series | 325is E36 |
| 1995-1999 | BMW | 3 Series | M3 E36 |
| 1996-1999 | BMW | 3 Series | 328i E36 |
| 1996-1999 | BMW | 3 Series | 328is E36 |
| 1997-2002 | BMW | Z3 | All E36/7 E36/8 |
| 1997-2003 | BMW | 5 Series | 528i E39 |
| 1998-2003 | BMW | 5 Series | 540i E39 |
| 1998-2003 | BMW | 5 Series | M5 E39 |
Why Choose Koyo?
- Decades of motorsport experience in cooling components
- CNC machined from aerospace-grade aluminum
- Proven in BMW racing applications worldwide
Frequently Asked Questions
-
Q: Will PI-1186 fit my 1996 BMW E36 328i?
A: Yes it directly replaces the factory drain plug on all E36 328i models from 1996-1999 with M14x1.5 radiator ports -
Q: What material is the seal made from?
A: High-temperature Viton O-ring resists degradation from coolant additives and heat up to 400F -
Q: Is there a warranty on this drain plug?
A: Backed by Koyo 1-year limited warranty against manufacturing defects when installed correctly
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Protective padded envelope 4 x 3 x 1 inches
- Weight: 0.10 lbs
Drain Plugs
Drain Plugs parts and accessories for Silverado, F 150, Ram, Mustang, WRX, Subaru, Honda, Toyota, Nissan, Jeep and other street and off road vehicles are stocked at Black Ops Auto Works. Shop magnetic oil drain plugs, quick drain valves, transmission drain plugs, differential magnetic plugs, radiator drain plugs, replacement drain bolts, crush washers, oversized repair plugs, stubby plugs and turbo oil drain fittings. Every product is filterable by year, make, model, trim, engine and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 34 drain plugs SKUs with fitment focused choices for maintenance, work, travel and performance builds. What Drain Plugs Cover This collection includes direct replacement drain plugs and service upgrades for oil pans, gearboxes, differentials, radiators and related fluid systems. Thread size and sealing style are essential to a leak free service. Magnetic and Quick Drain Options Magnetic plugs can collect ferrous wear m...
View Drain Plugs Products
Koyo
Koyo Koyo aluminum radiators and cooling components for WRX STI, EVO, Civic Type R, 350Z, 370Z, Miata, GT-R, Supra and other performance builds are stocked at Black Ops Auto Works. Shop N-FLO all-aluminum radiators, V-Series racing radiators, Hyper Core parts, radiator caps, filler necks, expansion tanks, intercooler cores and cooling accessories. Every product is filterable by year, make, model, trim, engine and drivetrain so the correct cooling part can be selected before ordering. Black Ops Auto Works carries 122 Koyo SKUs across street radiators, racing radiators, cooling service parts, pressure caps, aluminum tanks and universal cooling components. What This Koyo Collection Covers Koyo is known for application-specific aluminum radiators and cooling parts for Japanese performance platforms, plus selected Euro and domestic applications. Radiator fitment can vary by engine, transmission, core thickness, fan arrangement and chassis revision, so always verify the exact applicat...
View Koyo Products
Oil Systems
Oil system parts for supercharged HEMI, LS and LT platforms, diesel trucks, and daily drivers are stocked at Black Ops Auto Works. Shop oil catch cans, air oil separators, oil filters, oil pans, oil pumps, oil pickups, dipsticks, drain plugs, and motor oils for Hellcat, Redeye, Demon, Jeep Trackhawk, Ram TRX, Corvette, Camaro, CTS-V, Mustang, F-150, and Silverado applications. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 1,432 oil system SKUs across catch cans, filtration, and service hardware. What This Category Covers Oil system parts manage crankcase ventilation, filtration, and lubrication delivery throughout the engine. This collection spans oil catch cans, oil separators, air oil separators, oil filters, oil pans, oil pumps, oil pickups, dipsticks, drain plugs, oil baffles, and motor oils for street, track, towing, and high horsepower applications. Crankcase Ventilation...
View Oil Systems Products