The Ford Barn - View Single Post - Model A Times Article About Not Using Diesel Oil

Jeff/Illinois · 03-22-2018, 07:38 PM

I wouldn't use it simply because the detergents and additives are different for that oil from what a gasoline engine uses. Diesel engines develop soot that a gasoline engine does not.

Motor oil for gasoline engines states such, that it is designed for gasoline motors, on the label.

People are in love with the Diesel Rotella because they think somehow the Fed. Govt. left it alone when they ditched ZDDP in SL and older oils. That's like saying in 1975, when lead was taken out of gasoline, 'Well, Shell still has lead so I'll use that." Like everybody else had to conform to No-Lead but one oil company did not.

It has been talked about a lot, that you really don't need Zinc additives in a 4.0:1, low valve spring pressure Model A Ford engine. I've never heard of anyone having any problem using the SM motor oils in a Model A. And I don't think you will.

But, if it makes you sleep better at nite, get some ZDDP additive and dump in the motor along with Rotella.

03-22-2018, 07:38 PM	#4
Jeff/Illinois Senior Member Join Date: May 2010 Posts: 2,789	Re: Model A Times Article About Not Using Diesel Oil I wouldn't use it simply because the detergents and additives are different for that oil from what a gasoline engine uses. Diesel engines develop soot that a gasoline engine does not. Motor oil for gasoline engines states such, that it is designed for gasoline motors, on the label. People are in love with the Diesel Rotella because they think somehow the Fed. Govt. left it alone when they ditched ZDDP in SL and older oils. That's like saying in 1975, when lead was taken out of gasoline, 'Well, Shell still has lead so I'll use that." Like everybody else had to conform to No-Lead but one oil company did not. It has been talked about a lot, that you really don't need Zinc additives in a 4.0:1, low valve spring pressure Model A Ford engine. I've never heard of anyone having any problem using the SM motor oils in a Model A. And I don't think you will. But, if it makes you sleep better at nite, get some ZDDP additive and dump in the motor along with Rotella.