R A Bennell wrote:
Another oil question. I don't see much in heavier oil grades here but if I go 
south of the border, I see M1 in
heavier grades like 15-50 (I think - if my memory is OK) or 15-40 but it does 
not seem to indicate that it is for
diesels. I also saw M1 that said it was for turbo diesel trucks but I think it 
was something like 5-40.

Do I dare use either o these in my old 115 non-turbo diesel? So far, I am just 
sticking with Rotella but I read
somewhere that it is really not all that wonderful.

5w40 TDT is supposed to be the same as Delvac One, one of the best synthetic lubes for heavy duty diesels. Way above spec for a car that asks for SE-CC or SE-CD. I've been buying it at Meijer for as little as $16 a gallon on sale this summer. ($19.99 sale price on a day I had a coupon for $4 off any item priced 19.97 or higher)

15w50 Mobil One, extended performance or regular, is good stuff too. Exceeds the diesel ratings that were in effect when your car was made.

Multiple listers have reported excessive noise or oil consumption when using thinner than 5w40, like the much vaunted 0w40 for example.

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