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Message: <blockquote data-quote="T34r1tUp" data-source="post: 1903817" data-attributes="member: 14269">im a certified tech. i work on cars for a living. from experience i can tell you that oil is oil.Any liquid can build hydraulic pressure. your engine uses hydraulic pressure to create a film between your rotating components (crankshaft , camshaft) and you stationary bearings in your block.cars that specify synthetic oil are not necessarily engineered differently than those that dont specify. The only difference is the maintenance schedule. while under warranty the dealer wants you to service your car in intervals.the only difference between synthetic and conventional is how quickly it breaks down.Bottom line.....if you want to go longer between changes GO SYNTHETIC.if you want to save but are willing to keep changing your oil keep conventional.The myth about creating leaks is bull. A bottle of 5-30 is just as thick synthetic 5-30. the only way seals can leak with one oil and not the other is if one is thinner than the other.</blockquote>