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Designed for the listed application, this Mishimoto thermostats provides the exact configuration identified on this page. for 1984-2003 Nissan/Infiniti/Mercury Upgrade your engine cooling with the Mishimoto Nissan RB Racing Thermostat, engineered to open at 155°F (68°C) for faster warm-up and consistent lower operating temperatures during high-performance driving. This direct-fit replacement suits 1984-2003 Nissan 300ZX, Maxima, Pathfinder, Frontier, Quest, Infiniti J30, QX4, and Mercury Villager models with 3.0L/3.3L engines.
Key Features
- Direct OE Replacement: Matches factory dimensions and mounting points for seamless bolt-on installation without modifications on compatible Nissan RB and VG-series engines.
- High-Flow Design: Optimized wax pellet and larger bypass hole promote rapid coolant flow, sustaining peak performance in racing conditions.
- Durable Brass Construction: Corrosion-resistant brass housing with reinforced stainless steel spring ensures long-term reliability under extreme temperatures and pressures.
- Lower Opening Temperature: Activates at 155°F (68°C) versus stock 180-195°F, circulating coolant sooner to reduce heat soak and improve overall engine efficiency.
- Included Gaskets: OEM-style gaskets provided for leak-free sealing and quick serviceability during install or maintenance.
- Drain coolant before removal. torque to factory specs (typically 7-9 ft-lbs).
Fitment
| Years | Make | Model | Application Notes |
|---|---|---|---|
| 1993-1997 | Infiniti | J30 | Base, T |
| 1990-1992 | Infiniti | M30 | Base |
| 1997-2000 | Infiniti | QX4 | Base |
| 1993-2002 | Mercury | Villager | Base, Estate, GS, LS, Sport |
| 1987-1988 | Nissan | 200SX | SE, XE |
| 1984-1996 | Nissan | 300ZX | 2+2, Base, Turbo |
| 1999-2003 | Nissan | Frontier | Base, SC, SVE, XE |
| 1985-1994 | Nissan | Maxima | GL, GXE, SE |
| 1987-2000 | Nissan | Pathfinder | E, LE, SE |
| 1995 | Nissan | Pickup | Base, SE, XE |
| 1993-2002 | Nissan | Quest | GLE, GXE, SE, XE |
| 2000-2003 | Nissan | Xterra | SE, XE |
Specifications
| Brand | Mishimoto |
|---|---|
| Manufacturer Part Number | MMTS-RB-ALLL |
| Product Type | Thermostats |
| Fitment Type | Vehicle Specific |
| GTIN | 748666008588 |
| Condition | New |
What's Included
One new Mishimoto thermostats identified by manufacturer part number MMTS-RB-ALLL. Hardware, adapters, hoses, clamps, fluids, wiring, tools, and companion parts are included only when expressly supplied for this exact part number.
About Mishimoto
Mishimoto develops automotive cooling, intake, oil-management, exhaust, drivetrain, and vehicle-accessory products. Fitment, dimensions, interfaces, and included components remain exact-part-number specific.
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Frequently Asked Questions
Will this Mishimoto product fit my 1993-1997 Infiniti J30?
That vehicle range is listed, but confirm the engine, body configuration, production date, factory interfaces, and every current Mishimoto application note for this exact part number.
What connections and clearances should I verify?
Confirm every hose size, fitting, mounting point, fan or shroud clearance, sensor provision, fluid path, and surrounding component before installation.
Does the cooling system need to be serviced after installation?
Follow the vehicle and Mishimoto procedures for the exact product. Refill with the correct fluid, bleed trapped air, inspect for leaks, and recheck the level after heat cycling.
Installation Instructions
Follow the current Mishimoto instructions and vehicle service information for part number MMTS-RB-ALLL. Verify every interface and clearance, work on a cool and safely supported vehicle, use the specified fluids, fasteners, seals, and torque procedures, inspect for leaks or contact, and recheck the installation after the first heat cycle.
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