Re: 10W-40 motor oil

[UGAFarmist]

Is it true that once you use a synthetic oil, you shouldn't go back to 
regular oil or even semi-synthetic.  A mechanic told me this after I changed 
all my vehicles.  His reasoning had something to do with the coating the 
synthetic left on the engine.  It seems that you would end up with a 
semi-synthetic if you mixed them.

Howie
93 Max
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