I could be wrong but the only motor I ever seen recommend STRAIGHT 30 or 50 motor oil was a welding machine. isnt it missing the cleaning properties or some thing like that.
So if you break in the motor with 10W30 its possible to switch to SYNTHETIC no problem.
Coincidently, when I switched to SYNTHETIC in my 351C a piece of permatex used as thread sealer on the oil pick up came loose and jambed the pump. Not 100% sure but I have my theory to why. The other why is WHY someone would put thread sealer inside a feamle thread. In my case it hardened and over time or CHANGING to a defferent oil made it come loose.
Whats the properties that synthetic has besides not breaking down with heat ?
Ron
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