Quote:
Originally Posted by unavailablezl1
I have 4700 miles on the ZL1 and had the oil changed at 1700. I wanted to report for comparison: so for 3000 miles since the oil being changed the car burned 1.75 quarts. I don't baby it but don't redline it(much) and drive it fairly hard. Do you think is an acceptable amount of oil?
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Quote:
Originally Posted by Lashu74
I've been burning through it as well, about the same amount as op. I thought maybe using the Mobil 1 would help. My service shop claimed they were able to do my second change with the Mobil 1 but who's knows if they actually did. I was low after 1000 miles and first oil change. I was low on 2nd oil change and now I'm about half way through the life of what was supposedly Mobil 1 and its reading all the way at the bottom of the dip stick. It was definitely full when changed I checked it. I've been told that it's normal for these engines but this seems kind of excessive. I also get a nice cloud of black smoke out the exhaust when I get on it. It only seems to happen when I've been cruising a while and then get on it. I guess just burning off the build up?
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I've had my ZL1 M6 for 15 months now. Not my daily driver... 98% of the miles are to/from/at the drag strip or track. I check oil and everything else before each track day. I've never had to add oil except after an oil change. The car is at 5900 miles and I'm getting ready for my 6th (maybe 7th) engine oil change.
You guys should not be using that much oil. If you're using that much oil, especially if you see bursts of bluish smoke when you mash the gas,
your piston rings may not have seated properly during break-in. It's also possible you have a
clogged or malfunctioning PCV valve, resulting in excessive pressure build-up in the crankcase. I would expect the ECM to throw a code if this were the case, though.
If you're truly getting dark black smoke that's a separate problem. It's most likely from un-burned fuel. Look for clogged air filter or fuel system restrictions.
The viscosity of the oil will not have a measurable effect on the amount of oil you burn. When your engine is warmed up 40 weight oil will get sucked past the rings almost as easily as 30 weight if they're not seated.
--Cal