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If you have an older, more worn out engine, it could actually be for the better. There'll be less leakage of oil through the piston rings and other fine leaks will be reduced.

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Q: What would happen if you put 15w-30 oil in car that needs 5w-30 oil?
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What would happen if you use 5w30 oil in a 5w20 vehicle?

It might damage the engine because it might be to viscous. You need to check the manual for compatibility. Some engines allow refill with more viscous oil.