What motor oils are bad for sludge?

Answer 1

You won't see sludge much anymore unless its already accumulated in an old car. The oils of today no longer use paraffin (wax) as additives etc. Any name brand oil that is designated for your vehicle's engine is just fine. If you want to use really good stuff, spend the extra $$ and use synthetic.

Answer 2

At one time an oil with a high paraffin content would be a culprit for sludge formation.These days motor oils have to meet a set of standards (API) and are graded these will tell the consumer which oil is suitable for their application,and the oil container must have a seal which lists the API certification..Sludge is not a big problem anymore if the correct oil is used and regular oil changes are done.Below is a link to a site that will explain all about engine oils and answer all your questions.

Answer 3

If you mean what motor oils produce sludge then I gotta agree with fordman...any oil with wax as a base will sludge up a motor in no time. If you are asking what motor oils are bad at cleaning out sludge then I would have to say that ANY fossile oil would fit that description

Answer 4

I stay away from Pennzoil and Quaker-state, they are Pennsylvania crude and can cause sludge if left in to long, but If you change your oil every 2500 miles, you won't have to worry about it no matter what brand you use.

Answer 5

any of them if you dont change your oil every 2500 to 3500 miles or if your car is or has run extremly hot for periods of time.

Answer 6

The ones that have a wax base. I'm not sure if they still make them or not.

Answer 7

All of 'em if you don't change it regularly.