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1st guess is leaky valve seals. If this is the case, oil is seeping past the valve seals while the car is just sitting. Then when you start the car, the oil that has seeped into the combustion chamber is buring.

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โˆ™ 2004-07-01 08:04:39
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Q: What causes excessive smoke out of the exhaust during the first 10 minutes after starting?
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