Posted: Feb 27 2010 at 11:02pm | IP Logged

..

I believe certain engine conditions like short hops where the engine doesn’t get warm enough or a certain part of the engine gets to hot cause any oil to sludge. I the 1950s it was a lot more common. All my mechanic friends laugh at me for using Pennzoil. I’ve been using it since 1959. I’ve been using Wal-Mart pure synthetic (rumored to be Pennzoil) in my 11 year old Frontier. One engine put out by Toyota had a sludge problem and it didn’t matter what brand of oil. The engine was designed with an oil passageway too close to the exhaust. The last engine I’ve seen an engine with sludge it was a ‘shelled out’ Chevy 350 with a stuck exhaust heat riser. I do all our oil and filter changes at home… so I know it’s done correctly!

Have a good one! Don S..