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Subaru engines are known to leak oil externally. When that oil reaches a hot surface it burns. Hence the smoking engine. Check your oil level when you get gasoline and make sure it's always full. No big worries. You can get your engine steam cleaned from time to time and it should minimize if not eliminate the smoking but only for a time. Be happy that it's not an internal oil leak into your combustion chamber which would equal smoke coming out of your tailpipe.

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Q: What causes engine smoke?
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