MSW Oil Cooler Diverter Valve – S54 / S50B32

This Oil Cooler Diverter Valve is a simple but effective modification to your S54 or S50 Euro oil filter housing to ensure 100% of oil is cycled through the cooler.

With cars that came with a factory oil cooler (Euro E36 M3, all S54) there is a thermostat in the oil filter housing that limits the amount of oil that flows into the cooler, even when warm! This thermostat is closed when the engine is cold so that the oil warms up quicker. But even at operating temp the thermostat does not open all the way! E36 and E46 M3 owners who have experienced high oil temps at the track often don’t have an explanation or solution – until now.

This Oil Cooler Diverter Valve quickly remedies this issue by making the cooler full-flow. It diverts all oil through the cooler and lines for maximum cooling strategy. This will typically bring down stubborn oil temps 30+ degrees on tracked engines with the stock cooler. Once the housing is removed this is a quick 5 minute install into the factory S50 Euro or S54 oil filter housing. This is not recommended for street cars without the addition of a performance inline thermostat. Drive conservatively and allow extra time for the oil to reach optimal temp (>150 degrees).

Includes diverter valve, housing gasket, and installation instructions.