Q: Was blowing smoke, bluish white smoke, heavy

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Car had oil added, started blowing white smoke and had a whine when stopping. Whine has disappeared and the smoke seems to have stopped, but after sitting for 3+ hours in 70 degree weather, when started the smoke returns, kinda grayish and very heavy. Whine is not present. No idea what to even look for.

My car has 125000 miles.
My car has an automatic transmission.

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