Originally Posted By: Rob Taggs
It has usually been a 50/50 split in the past with older vehicles. The pan gaskets leaked or it was rear main leak. Seen others with similar things like this. Maybe more research needs to go into seal compatibility and synthetics. I've just seen this far too often.
Even if the old legend about synthetic oil causing leaks in older vehicles were true, it doesn't fit the scenario with your truck. First off, it's too new, and as someone pointed out, it's difficult to imagine any engine oil burning through seals or gaskets in 500 miles.
Secondly, GM, among several other manufacturers, uses synthetic as a factory fill in many vehicles, and the dexos standard means the likelihood of a GM vehicle getting a synthetic (or synthetic blend) from the factory is very high. If synthetic is going to be trashing seals or gaskets, GM will be paying for a lot of warranty work over the next few years and we're going to see a lot of engines puking expensive synthetic.
If it's leaking that new, then it's a production issue. I've seen very new vehicles, including GM trucks, leak. Take it to the dealer and have them fix it.