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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...