Oil Cooler Thermostat Rotor

Oil Cooler Thermostat RotorMarch 10th, 2026 NEWS BACK IN STOCK and ready to ship!!! Heat is a formidable enemy for the RX 8. In a rotary engine, a large portion of the engine cooling occurs in the oil cooler. The RX 8 oil coolers are quite large, but there is a thermostatic bypass in them which prevents them from operating until the oil gets up to temperature. It is important that they regulate the temperature, or else the oil can become excessively cold in winter weather.

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we offer precision machining to allow for the use of Mazda

or 20w50 for turbocharged rotary engines is specifically designed for use in rotary engines

* Highly polished end tanks

For the RX-8

*Price is for modifying 1 complete 2-rotor engine*

Designed for 2200cc injectors (38mm Bosch)

even better finish options

* Genuine Mazda FB03-61-190C

but will work

New banjo washers included

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