Wrong! Supertech oil is made by Warren Petroleum...They also make Kendall oils I believe. This oil will not cause any problems in a well-maintained engine. No, it doesn't cause sludge; sludge is an engine design flaw exasperated by lower-grade oil and poor filters(Frams are the worst, btw)...
For 3k miles, Supertech oil is fine, and the Supertech filters at Walmart are made by Champion, who also makes the Mobil 1 filters. Much better than the Fram orange cans of death!
Supertech synthetic oil is a Grp III oil with a relatively weak additive package, has been shown to be good up until about 5000 mi. in most engines.
