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Blue or purple smoke is oil and black smoke is a extremly rich fuel-air mixture. White smoke is normal unless you happen to have a blown head gasket or seal somewhere that is letting engine coolent into the combustion chamber. Sometimes when youve got an internal coolent leak in an engine you can tell by looking at your oil to see if its a creamy frothy looking mixture, if not and your not loosing coolent I wouldnt worry about it.
BKVic
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