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      10-03-2022, 11:39 PM   #7
LOWCAM
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Drives: 2010 E92 M3 Alpine Edition
Join Date: Sep 2022
Location: South Korea

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Quote:
Originally Posted by Helmsman View Post
I'd guess you'd see traces of transmission oil in the coolant. Never seen/read about this incident on the M3 so can't believe this is your problem. And if it would be a crack in the engine I'm sure you'd notice other issues... I'm sure its an easy to fix leak somewhere.

The typical places for leaks is the tiny hose from the reservoir to the thermostat housing, or the tstat to engine sealing. I had a significant leak in the latter after replacing Tstat, coolant ending up in the engine V between the banks (possible to see with without removing the plenum). After 2 liter I like to believe it should show on the floor though, finding its way throught the V and down rear of the engine.

Oil and coolant temperature OK? (there is a "secret" meny for coolant temp if you don't have a scanner).

still no visible leaks after parking 3 days
oil temp seems fine it stays under 100C
only gets slightly above 100C after hard driving
I'll check coolant temp via secret menu
thanks for all these info, tips!
Appreciate 0