What will happen switching from synthetic motor oil to conventional oil?

“I have been in the mechanic business for eight years and was always taught that you cannot go back to conventional oil from synthetic oil. I have seen the damage caused by going back to conventional. Is it true that you can switch back to conventional with no damage to your engine?”

Jimi Peranteu, Essington, Pennsylvania


Synthetic oils typically provide better protection than conventional oils, but switching back and forth between full synthetic and conventional oil will not damage the engine. Of course, this depends on the current engine condition and the quality of the conventional oil being used.

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