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Simplistic -- but, general rules of thumb.
1) blue smoke on acceleration - burning oil, maybe rings, maybe clogged pcv, combo of both.
2) blue smoke on start-up and/or deceleration - valve guides/seals
3) black/grey smoke on acceleration - too rich - something's amiss with engine control systems/fuel injection
4) "White" smoke - well, no such thing as white 'smoke' -- but steam appears as white 'smoke'. Steam -- coolant is getting into a combustion chamber. If antifreeze is being used, you can almost always smell it.
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82 242-6.2L; '17 Mazda3; '16 Crosstrek
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