I don't think Schaeffer's blend meet the Corvette requirement simply because they aren't labelled full synthetic, even though technically speaking they would pass all the tests needed as far as heat. The sad thing is that these oils outperform all of the group 3 oils, which technically aren't even synthetic anyways, but legally are allowed to be called so. For all intents and purposes Schaeffer's blends are just as good as full synthetics though, we've seen it in the UOAs on here.
I believe the fully synthetic 5w30 Schaeffer oil meet's Corvette requirements, but that oil isn't sold in single quarts unfortunately, only in 5 gallon pails or 55 gallon drums. Schaeffer Oil is missing out on a huge amount of sales, IMO, with this practice.
[ April 19, 2003, 12:47 PM: Message edited by: Patman ]