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2005 GMC Sierra - Page 7 Questions & Answers
2005 GMC Seirra 4.8l excessive oil consumption.
this is not a very good sign really. if you rev up to about 4-5 thusand rpm (more than usual) while driving in a safe mannor of course and see smoke then you will find the piston rings are probably going. you might al;so want to take into consideration that your valve stem oil seals are all internal as well so no real sign of leakage.so could also be the culprit.
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