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mhsprecher · 07-20-2019, 09:42 PM

I use Mobil 1 Synthetic in my Model A's and my 39 Ford V8. I have been running 10w-30, but I want to change to 10W-40 as Ford recommended 40w in the summer. Maybe it doesn't make that much difference? FWIW, Ron Ehrenhofer, who is the technical guru for the Model A News for MARC, uses synthetic in his cars.

07-20-2019, 09:42 PM	#13
mhsprecher Senior Member Join Date: Aug 2012 Location: Takoma Park, MD Posts: 2,817	Re: Synthetic Oil I use Mobil 1 Synthetic in my Model A's and my 39 Ford V8. I have been running 10w-30, but I want to change to 10W-40 as Ford recommended 40w in the summer. Maybe it doesn't make that much difference? FWIW, Ron Ehrenhofer, who is the technical guru for the Model A News for MARC, uses synthetic in his cars.