Motorsport Thermostat - E46 M3, MZ3 S54, Z4M, E36 Euro M3

The Rogue Motorsport Thermostat is a must for any E46 M3 or Euro E36 M3 that sees time on track where temperatures are above normal. We've found that the cooler you can make these engines run, the more power you'll have, so this 55 °C Motorsport Thermostat is ideal. Longer warm-up time should be expected in cooler areas of the country.

Fits all years of E46 M3, 2001-2002 MZ3 S54, and Z4M. Also Fits Euro-spec S50B30 and S50B32 E36 M3 engines - will NOT work in US-spec E36 engines.

An o-ring is NOT included. This can use a stock EPDM rubber o-ring or Rogue's upgraded Viton o-ring. Please see our o-ring options under Related Items below.

For track/racing use only. Not designed or intended for street/road use.

Rogue Engineering has worked with a OE manufacture to produce a version of the thermostat with near identical specifications.  Production of these are followed up with individual batch testing to ensure functionality at the desired lower temperatures.