white smoke
Rings will burn smoke all the time, valve seats are when shifting gears (usually more noticeable at higher rpms , or once an old mechanic told me)
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This is correct, allthough if you are seeing black in your fuel injected vehicle it means that it is running rich (too much fuel is being injected and not all is being burned) This will cause your O2 sensor to fail and your "Cat" to plug up
Sounds like valve guides to me, you will next have to do a compression test in your cylinders is the best way to tell, or you can pull spark plugs and pick the worst looking one, but I suggest the compression test as being more accurate.
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myself accordingly sir.

