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yea I dont know how true it is, but I have heard that synthitic oil is so thin that on a newer motor it can slip past the rings and burn a little bit of oil. Once the motor is fully broken it it can be run on synthetic oil.
I'm not sure on this though because most new cars come with synthetic oil from the factory. Maybe they break in the motors a bit prior to putting hem in the cars or something, but maybe this is part of your problem.
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