Farm Equipment - Synthetic motor oil

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Synthetic motor oil

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=193729
Printed Date: 27 Aug 2025 at 6:07am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Synthetic motor oil

Posted By: mikeyD
Subject: Synthetic motor oil
Date Posted: 24 Feb 2023 at 5:30pm

Should I use a synthetic blend oil in my 1947 Allis C?
I heard it could make some leaks show up that were not there before.
Is the oil industry phasing out conventional oil? Seems a bit harder to find than the synthetics.

Replies:

Posted By: AC720Man
Date Posted: 24 Feb 2023 at 8:40pm

I’m a big supporter of synthetic oils in newer engines but not in the ole girls we all enjoy. Leaks will develop where they may not have been before or leak worse in areas that were already leaking. My hi horsepower Eagle Talon came from the factory with Mobil 1 synthetic in 1990. When I sold her she was still making 300 hp on a big turbo and tuner through AWD with 300,000 miles on it. It is some good stuff when the engine is engineered for it. Don’t ever switch from synthetic to regular oil, conventional oils do not have the same slippery properties as synthetic. I’ve seen several engines spin the bearings after as few as 500 miles when the owner decided to go to conventional oil because it was cheaper.

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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD

Posted By: mikeyD
Date Posted: 24 Feb 2023 at 9:33pm

AC720Man - Thanks for the reply. I will stick w/conventional.