Well, I guess I should change my screen name on all message boards. I just picked up a 94 Toyota Corrolla DX, 1.8L (not the weak 1.6L) 5 speed manual. Car has 70,ooo miles, is a one owner car bought from original owner, and has all dealer service records, even for cooling system service. The guy apparently did oil changes himself, as they were documented in the owner''s manual. Taking a look under the oil filler cap revealed fair aount of varnish, but no noticeable sludge.
The car is freakin cherry, runs and drives better than my 99 Grand Am, that's why the Grand Am has got to go.
Now, on to what oil she should use. I just changed the oil the day I purchased the car to 5w-30 penzoil with a napa gold filter because it's been about 2 degrees out lately. If I switch to mobil 1, will I get leakage? I'm also thinking of switching to a 15w-40 like Penzoil's. Are these oils truely safe for a gasoline engine, and will they theoreticaly clean up sludge and varnish better? Thanks