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Sorry to ask this but are you sure it was white? Or looked white? WHite smoke is usually associated with antifreeze. A large puff of oil (blueish color) every once in a while seems common from what I have read over the years. Before I replaced my AOS (a year after I bought it) I was getting a puff of smoke which started infrequently and got more frequent (like once a week) before it totally went and was blowing smoke until I got home 10 minutes later. My AOS is 3 years old now and I would say over the three years I've got a puff maybe 5 times. Bad valve seals can also create a puff at start up but generally when those start to go bad, you get smoke every startup. So definitely try to determine if it was white or blue. If it was a blue puff, then I would hold off to see when it happens again. If it's white, it would definitely be more concerning.
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