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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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Old 09-27-2014, 07:20 AM
khalbina khalbina is offline
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Join Date: Sep 2014
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Mein Auto:
Smoking at tailpipe

I have a 2004 BMW Z4 2.5L stated smoking at the tailpipe.. IT smokes quite a bit, especially when you rev it up. Enough to smoke out the whole area with a lingering cloud. It smells like burnt oil.

The oil is low. All 6 spark plugs all have oil on the tips. The compression is good across the board at 181 +/- 2 psi. The mileage is 127,000.

How could oil get into all 6 cylinders? I think the compression test rules out a the piston rings or valve stem seals. What are the other possibilities?

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Old 09-27-2014, 04:59 PM
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dc_wright dc_wright is offline
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Location: Orlando, Florida
Join Date: Nov 2007
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Mein Auto: '96 328iC, '04 325Ci
If your oil separator has failed you'll pull oil in through the intake manifold instead of it draining back into the crankcase.

2006 Z4 3.0si Sport Package (But I'll still hang with my "homies" in the E36 forum)
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