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G.M. · 05-09-2010, 01:17 PM

I have used Castrol 20/50 for well over 35 years even in older diesels. I put it in my 39 over 30 years ago at start up on a new engine and it has over 103,000 miles with alot of highway (Columbia 3:78) traveling at 65 to 70 MPH. Had the pan off for an oil leak at 85,000 and the bottom end was clean and no sludge at all in the pan. G.M.

05-09-2010, 01:17 PM	#14
G.M. Senior Member Join Date: May 2010 Location: Florida and Penna. Posts: 4,471	Re: oil recommendation for 40 flathead I have used Castrol 20/50 for well over 35 years even in older diesels. I put it in my 39 over 30 years ago at start up on a new engine and it has over 103,000 miles with alot of highway (Columbia 3:78) traveling at 65 to 70 MPH. Had the pan off for an oil leak at 85,000 and the bottom end was clean and no sludge at all in the pan. G.M.