I use Mobile 1 and I change oild sometimes 4000miles sometimes 6000miles depending if I have time or not for years all ready with many different cars. The thing is that you need to remember to add some oil 1/2 between oil change for all cars. I have keep to this and all my car runs without engine or overheating problem before I sell them. All of them working fine and still going strong some at 150,000
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