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My 88 Ferrari Testarossa just had it five year major service performed by one of the highest rated mechanics in the country. He uses mobile 1 15 W 50 in these vehicles but also around a qt of lucus oil stabilizer. I was a little surprised by that because I’ve always heard that it actually does...

I have a 1984 Ford LTD former police car with the 5.0. There is a little puff of oil smoke upon acceleration and occasionally upon start up. I had a leak down and compression test done and discovered that the rings are worn and there is some blowby. I will be rebuilding this engine shortly. In...

I have a 1997 Chevy K1500 with the 5.7 vortec engine. It has 371000 miles on it but still runs perfect. If compression and oil pressure are good, should one still avoid hard driving/red lining this engine simple due to the fact it has so many miles? In my mind it seems like this engine would be...

From my understanding practically all engine wear occurs at cold start and until operating temperature is reached. Does any real wear occur after everything has reached operating temperature or does the oil film pretty much eliminate all metal to metal contact? For example, would there be any...

I have a 1984 Ford LTD police interceptor with the 5.0 H.O 302 engine. The car is basically a 4 door Mustang. I tend to drive it pretty hard, I just drove about 6 miles with the pedal held to the floor. The engine naturally generates a lot of heat, would M1 15w50 be too heavy for this engine...

What is the ideal zppd content in a motor oil for a flat tappet engine?

Roughly how much of an effect would going up, or down, one weight of oil have on engine oil pressure at operating temperature? For example going from a 10w30 to a 10w40, or a 5w50 to a 5w40 etc. Is the effect significant or, typically, negligible?

I have a 1988 Ferrari Testarossa that is going in for a major service in December. I changed the oil last October using Redline 10w50 and I’ve put around 2000 miles on the car since then. Would there be any issues leaving the oil in until December as they will have to drain it for the service...

This is a sheer curiosity question. Do piston rings make contact with the cylinder walls or does oil prevent metal to metal contact? I just can’t see how rings can seal without metal to metal contact. And if there is metal to metal contact, how are rings not worn out extremely quickly? If oil...

I picked up a barn find 1985 Chrysler Laser with the 2.2 turbo motor. I’ve been restoring it and I ran an oil analysis after the first oil change. Looks like this engine has a few issues. I assume the presence of coolant means I have a head gasket leak. The wear metals also seem to be a bit...

I took the advice of several forum members and used Mobil 1 15w50 in my Ferrari Testarossa. I am in Alabama where it rarely drops below freezing. However, it looks like we might get a once in 30 year cold snap next weekend. They are saying lows could be around 10F. I seriously doubt I will...

Greetings everyone! I own a 1988 Ferrari Testarossa, 40k miles. The workshop manual calls for a 10w50 oil. According to the last service record, right before I took delivery of the car, the oil used was Liqid Moly Race Tech 10w60. It’s almost time for it’s next annual fluid change service so I’m...