Farm Equipment - 30W or 15-40?

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30W or 15-40?

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=188288
Printed Date: 21 Jun 2025 at 11:30am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 30W or 15-40?

Posted By: Play Farmer
Subject: 30W or 15-40?
Date 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.

Replies:

Posted By: DrAllis
Date 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.