Changing oil……………
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=210761
Printed Date: 15 Apr 2026 at 8:30am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Changing oil……………
Posted By: Lars(wi)
Subject: Changing oil……………
Date Posted: 14 Apr 2026 at 7:10pm
Time has arrived again for the F-350. Waiting on oil and fuel filter to arrive via Amazon. Just could no longer justify the prices at the Ford stealership.
Now in search of CI-4/CJ-4 diesel engine oil. Have been using Mobil Delvac Extreme 15w40(CK-4) the past three changes, but the price on that is also becoming unjustifiable.
Heading to Midland Texas later this week, I should be to acquire the rest of what I need there. Even all the national chains that within 30 miles of my house have a wider selection of brands in Midland.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Replies:
Posted By: steve(ill)
Date Posted: 14 Apr 2026 at 7:35pm
Wal Mart sells Delvac for $15. a gallon........ what are you lookin at $$ ?
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Like them all, but love the "B"s.
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Posted By: Lars(wi)
Date Posted: 14 Apr 2026 at 8:18pm
Delvac 1300 15w40 is a great oil for todays modern diesels (CK-4)
I have been researching, lately and the general consensus is for older(way older) diesels a CF or CI has better additive package especially for non-turbo engines. CF is like trying to find a needle in a haystack, but CI/CJ is more prevalent.
A couple weeks ago I noticed Wally World was charging over $50.00 for the 2.5 gal jug of 15w40 full synthetic. I have noticed a slight oil leak on the back side of one valve cover, hopefully a high quality mineral oil will stem the leak from getting worse. I change oil & filter every 3,500 miles.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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