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Originally Posted by RandallNeighbour
While I am no expert, I have heard that it's not good to go from synthetic to mineral to synthetic oils.
So, the factory filled Mobil 1 is sythetic and you're going to go to mineral and then back again?
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I've heard that myth also but it isnt true, The engine is a machine and switching oils from normal oil to synthetic have any ill affects on the motor.
The reason you use regular non-synthetic oils for break-in is cause the standard oils aid in getting the bearings, piston rings and other oil lubricated parts to set into there groves...I think synthetic isnt used in high power application break-ins mainly cause it protects internal engine parts so well that it would take a very very very long time for the engine to break in and the piston rings wont sit well enough in there sleeves.