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30W or 15-40?
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Play Farmer View Drop Down
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Joined: 13 Jan 2016
Location: NNY
Points: 732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Play Farmer Quote  Post ReplyReply Direct Link To This Post Topic: 30W or 15-40?
    Posted: 16 May 2022 at 9:49am
I have always used 15-40 diesel oil in all of my diesels. 

Looking at the book on my 7000 it clearly states "Do Not use multi-viscosity oils in Allis Chalmers diesel engines".

Is that still the thinking today or was that a 70's thing? 

Thank you. 
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Joined: 12 Sep 2009
Points: 21583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2022 at 9:52am
The book was printed before 15W-40 was invented. They don't re-write the books for older equipment. 15W-40 was standard factory fill by 1977 or 78 in all A-C engines.
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