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while most synthetic is not 100% percent but rather a mixture of dino and synthetic what he is telling you is pure bs. If you buy mobile 1 not mobile clean 5000 or 7500 but the original mobile one that is a pure synthetic. that mechanic just wants your money dont listen to him, and dont take your car back to him. If he is trying to hustle you out of money on oil I cant imagine what he might do.
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