The attached link has a very good article about oil and appears to be written by someone who knows there stuff. I found this while doing a search to find out who makes the wal-mart brand super tech synthetic oil. It is a pretty long read but well worth the knowledge, imo. Has anyone used the super tech brand oil? Curious how it worked. I know you typically get what you pay for but at $11.00 for 5 quarts it's hard to pass up. This article says that super tech is quaker state in a different package. Anyway hope this is informative and helpful. Sorry, here it is.