oil consumption

2005 GMC ENVOY
6 CYL
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BRYAN SAMS
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I have a 2005 envoy, 4.2 6cyl.74,000 miles. I bought it with 70,000 miles & fresh oil change, checked the oil and it was a quart low, no leaks, no noticeable burning. are the 4.2L noted for oil consumption?
Dec 22, 2010 at 9:04 PM
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MHPAUTOS
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What weight oil are you using and is it mineral or synth?

Mark (mhpautos)
Dec 26, 2010 at 11:52 PM
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BRYAN SAMS
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I have to assume the dealer used 5w30 mineral, but I also assumed that the oil was filled to the proper level also, which may not be the case. I am doing weekly oil checks until I see what is going on. Would synth be a better oil to use for this engine?
Dec 29, 2010 at 3:50 PM
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MHPAUTOS
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I would monitor the use just for now, lets see what the actual consumption is like first.

mark (mhpautos)
Dec 30, 2010 at 12:28 AM
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BLUEMAJESTO
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Hey bryan....have the same issue....I've been monitoring for the last year ....finally the warranty company is replacing engine. Mine has 62,500 miles, bought it at 44,000, burns 2 quarts every 450 miles hwy , abit slower city driving..as for where it's going?..when jumping on the highway...punch it..look in the rearview..pp behind you won't be happy to have an oil caked windshield but you'll know where it's going..dealer says most likely cause "bad rings"..hotfix..replaced engine...make sure ya got a warranty...not a cheap fix.
Feb 16, 2011 at 2:26 PM