MACK MAN Posted January 21, 2012 Share Posted January 21, 2012 I recently bought a 1926 Mack AC,I want to change the oil in the 4 cyl gas engine.The engine is not filtered.The question is do I use a non detergent oil or do I use a detergent oil?A few guys tell me a detergent oil in a old engine will cause problems,and some say go with the non detergent oil thats what was use back than.Also should I go with a multigrad oil or a 30weight? Thanks AL Quote Link to comment Share on other sites More sharing options...
phildirt Posted January 21, 2012 Share Posted January 21, 2012 I have used both in 1920's engines. The "detergent" in the oil is not for cleaning but for keeping byproducts of combustion in suspension for removal by a filter. If there is no filter, I use non- detergent.You will get sludge in the engine with the non- detergent oil unless the engine is run until the oil is hot and kept hot for a while.The rule that our grand parents used on oil was: CBS (Cheap, Black and Slippery)! Quote Link to comment Share on other sites More sharing options...
berryman Posted January 22, 2012 Share Posted January 22, 2012 I'm working on a 1926 also I was wondering if you have taken the front wheels off I am trying to figure out if there is any kind of grease seal in there Quote Link to comment Share on other sites More sharing options...
fauthpk Posted January 22, 2012 Share Posted January 22, 2012 I would imagine the grease seal was made of leather. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.