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Probably the reason the car was on the market to begine with. If the oil changes were not done on schedule it might be worn out. If synthetic oil was used you can go by the FSS (oil change reminder system, which has a base setting of 10,000 miles and can go up or down from there), but if non-synthetic was used you want to do it sooner than that.
Problem now is probably keyholing of the cylinders.
Gilly
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