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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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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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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.

http://bmwfans.info/parts-catalog/E8...oil_separator/
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