Was there synthetic oil in the car before you put some in there? Synthetic oil is thinner than conventional oil and can slip past seals till they get used to the oil. I haven't put synthetic oil in my supra for partly this reason, other reason is I pref. high mileage oil since I'm getting close to 140k miles.. However, I have seen this first hand w/ my stepfather's Buick Grand National when he went from conventional to AMS Oil synthetic... the next morning the car had dropped most the oil from all the seals..
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