I gave up on those 20/50, 10/40, etc., when I bought my first Mercedes
diesel. The recommended oil for a diesel is 15/40 which is a much higher
quality oil and made for much more abuse than standard oil blends. Don't
know much about the synthetics but they are generally not recommended for
diesels. I now use this higher grade oil in all my vehicles, including a '73
ford F-250 (390 engine) and my 1949 Ford tractor. Wouldn't use anything
else. Check it out.
The only difference between SAE 20W-50 and SAE 15W-40 is the
amount of viscosity modifier added to the mix.
SAE viscosity grades have nothing to do with the quality of the oil.
"Ernie Sparks" <earnest37@sbcglobal.net> wrote in message
news:JA8Xd.5067$C47.1632@newssvr14.news.prodigy.com...
> I gave up on those 20/50, 10/40, etc., when I bought my first Mercedes
> diesel. The recommended oil for a diesel is 15/40 which is a much higher
> quality oil and made for much more abuse than standard oil blends. Don't
> know much about the synthetics but they are generally not recommended for
> diesels. I now use this higher grade oil in all my vehicles, including a
'73
> ford F-250 (390 engine) and my 1949 Ford tractor. Wouldn't use anything
> else. Check it out.
>
>
And who says that synthetics are not generally recommended for diesels. My
daddy's 1992 Dodge Cummins lists oil specs for both standard and synthetic
oil!
"mcalister" <nospam@nospam.net> wrote in message
news:L49Xd.16746$3z.4413@okepread03...
> The only difference between SAE 20W-50 and SAE 15W-40 is the
> amount of viscosity modifier added to the mix.
> SAE viscosity grades have nothing to do with the quality of the oil.
>
> "Ernie Sparks" <earnest37@sbcglobal.net> wrote in message
> news:JA8Xd.5067$C47.1632@newssvr14.news.prodigy.com...
> > I gave up on those 20/50, 10/40, etc., when I bought my first Mercedes
> > diesel. The recommended oil for a diesel is 15/40 which is a much higher
> > quality oil and made for much more abuse than standard oil blends. Don't
> > know much about the synthetics but they are generally not recommended
for
> > diesels. I now use this higher grade oil in all my vehicles, including a
> '73
> > ford F-250 (390 engine) and my 1949 Ford tractor. Wouldn't use anything
> > else. Check it out.
> >
> >
>
>
Not sure upon what you based your answer but you may be right. However,
ordinary 10-40 and 20-50 oil lists API service of either SH/CD or SJ while
15-40 oil lists API service classifications of CI-4, CI-4 Plus, CS-4, CF-4,
DF/SL and SJ. This is service recommended by Catipillar, Cummings,
Mercedes-Benz, etc.
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