Description
The Mishimoto MMOC-MIA-99T is a purpose-built oil cooler kit engineered specifically for the 1999-2005 Mazda Miata NB, replacing the factory liquid-to-liquid setup with a dedicated 10-row bar-and-plate cooler. During testing, this kit dropped oil temperatures by 10°F (5.6°C) on a 65 mph highway cruise, giving track-day Miata owners real margin against the heat that builds during hard laps.
Built around a silver, anodized 10-row bar-and-plate core, this Mishimoto oil cooler kit is designed to protect engine components from the oil temperature spikes that stock NB Miata cooling can’t handle once you start pushing the car on track or adding forced induction. A billet aluminum thermostatic oil sandwich plate keeps oil away from the cooler until it reaches optimum operating temperature, which matters just as much in cold weather since overcooled oil can be as damaging as overheated oil. The kit’s application-specific mounting brackets double as ducting, channeling air directly to the cooler core while keeping the unit tucked away from the front bumper so there’s still room for an intercooler if you’re running a turbo. Pre-made stainless steel braided lines with -10AN fittings round out the setup, and Mishimoto backs the kit with its Lifetime Warranty.
Vehicle Applications
This Mishimoto oil cooler kit is a direct fit for the Mazda Miata NB, covering the Base trim from 1999 through 2005 and the LS trim from 2000 through 2005. It is built around the NB chassis and the 1.8L BP engine code, and it works with most aftermarket turbo kits for owners running forced induction on their Miata.
Features
- Direct fit for the 1999-2005 Mazda Miata NB
- Reduces oil temperatures by 10°F (5.6°C) during 65 mph highway testing
- Application-specific mounting brackets double as ducting to channel air to the cooler
- Mounts away from the front bumper to preserve room for an intercooler
- Minimal pressure drop and compatibility with most aftermarket turbo kits
- Billet aluminum thermostatic oil sandwich plate brings oil to optimum temperature before cooling
- Pre-made stainless steel braided oil lines with -10AN fittings
- Increases oil capacity by 0.5 qt
- Backed by the Mishimoto Lifetime Warranty
- Kit includes application-specific mounting brackets and oil cooler ducts, a 10-row oil cooler, stainless steel braided hoses with 90-degree and 120-degree -10AN fittings, an M20 thermostatic sandwich plate, an M20 stainless steel sandwich plate adapter, M20 x -10AN straight fittings, a large O-ring, and a mounting hardware set
Specifications
- Brand: Mishimoto
- Part Number: MMOC-MIA-99T
- Core Type: Bar-and-Plate
- Core Color: Silver
- Finish: Anodized
- Grade Type: Performance
- Core Height: 2.76 in
- Core Thickness: 1.97 in
- Core Width: 11 in
- Inlet/Outlet Fitting Type: AN Flare (Male)
- Engine Code: 1.8L BP
- Chassis Code: NB
- Oil Capacity Increase: 0.5 qt
- Recommended Fitting Torque: 15-25 lb-ft (do not exceed 35 lb-ft)
Frequently Asked Questions
What vehicles does this Mishimoto oil cooler kit fit?
It is a direct fit for the 1999-2005 Mazda Miata NB Base and the 2000-2005 Miata NB LS, built for the NB chassis and 1.8L BP engine code.
How much does it lower oil temperature?
In testing, the kit reduced oil temperatures by 10°F (5.6°C) during a 65 mph highway cruise.
Does installation require any cutting?
Yes, installation requires cutting the plastic undertray; the OEM part number for the undertray is NA01-56-111F.
What is included in the kit?
The kit includes application-specific mounting brackets and oil cooler ducts, a 10-row oil cooler, stainless steel braided hoses with 90-degree and 120-degree -10AN fittings, an M20 thermostatic sandwich plate, an M20 stainless steel sandwich plate adapter, M20 x -10AN straight fittings, a large O-ring, mounting hardware, and the Mishimoto Lifetime Warranty.
Will this work with a turbo setup?
Yes, the kit works with most aftermarket turbo kits and mounts away from the front bumper to leave room for an intercooler.
What torque should I use on the fittings?
Mishimoto recommends 15-25 lb-ft for all straight fittings and banjo bolts, and the maximum torque rating of 35 lb-ft should not be exceeded.
âš WARNING (California Proposition 65): This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
