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I wonder how much of a difference it makes where a specific model car is made. Some models are made in a number of countries. I don't know whether the spaces between the parts are the same or not.

How does a person know whether the engine rejects it or not?

There are various weights of oil, of course. Is there an amount of miles on a vehicle where it is a good idea to jump up a weight in oil? In other words, is there a certain amount of miles where to get the same function from the weight a person was using, that person needs to go up in weight...

Can that rust be prevented if a person is proactive with anti-rust maintenance?

I have PL-M oil, which I bought for firearm use. It is surplus. I used it on a firearm and left it for 2 to 3 months. When I picked it up, I noticed all the controls were stiff. I took the firearm apart and noticed the oil became sticky and hard. In some places, it had become a sort of shell. Is...