2005 gmc envoy_slt_xl
Hmmm Interesting... So my 2005 Envoy XL with the 5.3 is starting to use oil. I have 48,000 miles on it. When I say starting I mean 5 quarts in 8000 miles. I have been getting the oil changed at the dealer since I bought it. I get the Mobile 1 with what I am guessing is a GM filter. Well this is my 3rd synthetic oil change and its the first one that I have used so much oil. I didn't use any on the first change and only had to add one quart on the second change. So I questioned two dealers about this. The first dealer (GMC only one near me) told me that GM says a quart every 2,000 miles is considered normal. The second dealer (Buick) said the same thing but he also told me this. He (master mechanic) told me that the 5.3's were not made to run synthetic oil. That the synthetic oil would coat the cylinder walls and rings so good that some oil would pass simply getting burned. He also said the oil life reading was based on regular oil. I have been getting my oil changed every 10,000 miles regardless what the readout says. GMC dealer said disregaurd the oil life reading while using synthetic and the Buick dealer said go by it. So he recommened going back to regular oil and and suggested that after a couple of oil changes it should stop using so much oil. So what should I think about all this. Crap or not??? Anybody...