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L78CHEVELLE · 07-18-2019, 09:54 AM

Saw a TV show not long ago were a few old cars were driven across the country. One of the old cars was a Ford flathead. This show was sponsored by Shell Oil. The flathead Ford driver said Shell ran several test to determine the best oil to use in the flathead for the cross country trip. The oil Shell provided to the flathead drivers was the synthetic mix 10W 40. Just my 2 cents worth.

07-18-2019, 09:54 AM	#19
L78CHEVELLE Senior Member Join Date: Jul 2010 Location: London Kentucky Posts: 356	Re: Mixing synthetic and regular oil Saw a TV show not long ago were a few old cars were driven across the country. One of the old cars was a Ford flathead. This show was sponsored by Shell Oil. The flathead Ford driver said Shell ran several test to determine the best oil to use in the flathead for the cross country trip. The oil Shell provided to the flathead drivers was the synthetic mix 10W 40. Just my 2 cents worth.