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 https://www.bigmacktrucks.com/topic/22786-detergent-or-non-detergent-oil-help/ 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 https://www.bigmacktrucks.com/topic/22786-detergent-or-non-detergent-oil-help/#findComment-99025 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 https://www.bigmacktrucks.com/topic/22786-detergent-or-non-detergent-oil-help/#findComment-99179 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 https://www.bigmacktrucks.com/topic/22786-detergent-or-non-detergent-oil-help/#findComment-99183 Share on other sites More sharing options...
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