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You really can't without having the oil analyzed. More expense than it's worth. Unless the oil is so fresh that it isn't dirty looking yet, change it and the oil filter right now. If the oil is THAT fresh, all nice and clear colored, suspect that the seller had some reason for changing the oil just before he let you look at the car.

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โˆ™ 2015-07-15 19:52:59
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Q: How can you tell if a car you recently bought has synthetic motor oil in it?
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