I do it. I use Mobile 1 fully synthetic oil and substitute a quart with the lucas oil. Been doing it for about 2 years and my cars still running like a champ, 01 Grand am. Got it with 35k miles and...
Sure! there is nothing wrong with them just try to make sure you dont overfill your engines oil limit.
As heat and gases form during combustion it causes the gradual depletion of the oils high...
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