2016 F10 M5 Comp smoke after Warm engine idling

pil2255 · 10-11-2022, 10:01 AM

Hi All

I have noticed that i have an initial puff of white / blueish smoke when revving the engine after a lengthy period of idling (5mins approx) this then subsides and no noticeable smoke after when driving. Anyone have any ideas on this ? is this normal?
Thanks Mike

m5rosco · 10-11-2022, 02:48 PM

Valve stem seals are normally the culprit for that. May be worth checking/replacing the PCV valves first though as they are fairly cheap and are easy to change and can cause oil to be burned/smoke. Stem seals are a major and expensive job!

10-11-2022, 10:01 AM	#1
pil2255 Registered 0 Rep 4 Posts Drives: BMW F10 M5 C Join Date: Oct 2022 Location: Essex UK iTrader: (0)	2016 F10 M5 Comp smoke after Warm engine idling Hi All I have noticed that i have an initial puff of white / blueish smoke when revving the engine after a lengthy period of idling (5mins approx) this then subsides and no noticeable smoke after when driving. Anyone have any ideas on this ? is this normal? Thanks Mike
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10-11-2022, 02:48 PM	#2
m5rosco Second Lieutenant 253 Rep 272 Posts Drives: 2016 F10 M5 Join Date: Jun 2020 Location: UK iTrader: (0)	Valve stem seals are normally the culprit for that. May be worth checking/replacing the PCV valves first though as they are fairly cheap and are easy to change and can cause oil to be burned/smoke. Stem seals are a major and expensive job! Last edited by m5rosco; 10-11-2022 at 03:07 PM..
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