One problem related to engine oil leaking has been reported for the 2018 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 GMC Sierra 1500 based on all problems reported for the 2018 Sierra 1500.
This vehicle has 88400 miles, it out of warranty, which I know this, I use amsoil asm sig series syn sae 0w-20 , 5. 3l gas. Two years ago, I changed oil at richard Buick GMC in dayton, OH and sent a sample of the oil to oil analyzers for an analysis, they set it back, it showed there was a level 4 severe gasoline in the oil. They changed the high speep fule pump, both in jectors, and it thought it was fixed, on 12 - 11 -24 had the oil changed at local boys service center, sent a sample of the oil-to-oil analyzers and recieved back, a severe fuel leak of gasoline in the oil, I don't think that many drivers who have this vehicle know about this dangerous problem, it could cause an engine failure or even worse, general motors needs to fix this perblem.