barnett468 Posted October 28, 2019 Share Posted October 28, 2019 2 minutes ago, Grimy said: Now you can see sludge buildup in crankshaft oil passages: "Crank turds" from a friend's 1920 Pierce-Arrow That is quite obviously not the norm and doesn't occur under normal use and normal maintenance etc. Link to comment Share on other sites More sharing options...
Grimy Posted October 28, 2019 Share Posted October 28, 2019 1 minute ago, barnett468 said: That is quite obviously not the norm and doesn't occur under normal use and normal maintenance etc. Depends on what "normal" is to you--that's from a lifetime of non-detergent oil plus (probably) a lot of sitting. yet a number of collectors seem to want to run non-detergent (I agree, that's a misnomer) in their pre-war cars. Link to comment Share on other sites More sharing options...
barnett468 Posted October 28, 2019 Share Posted October 28, 2019 38 minutes ago, Grimy said: Depends on what "normal" is to you--that's from a lifetime of non-detergent oil plus (probably) a lot of sitting. yet a number of collectors seem to want to run non-detergent (I agree, that's a misnomer) in their pre-war cars. From an engine builders standpoint, I really don't know why they would run a non detergent oil, but if they do, they should change it frequently whether they drive the car much or not. Link to comment Share on other sites More sharing options...
Grimy Posted October 28, 2019 Share Posted October 28, 2019 1 minute ago, barnett468 said: From an engine builders standpoint, I really don't know why they would run a non detergent oil, but if they do, they should change it frequently whether they drive the car much or not. Agree! Detergent oil won't loosen previous crud (at least. to any appreciable degree), but will minimize any deposits from current oil. Link to comment Share on other sites More sharing options...
avgwarhawk Posted October 28, 2019 Share Posted October 28, 2019 38 minutes ago, barnett468 said: From an engine builders standpoint, I really don't know why they would run a non detergent oil, but if they do, they should change it frequently whether they drive the car much or not. It's to my understanding that detergent oil is not for cleaning but suspending particles to be filtered by the oil filter and not sink to the bottom of the oil pan. I'm onboard with you. No detergent oil change frequently. Link to comment Share on other sites More sharing options...
Spinneyhill Posted October 28, 2019 Share Posted October 28, 2019 NO! "Non-detergent oil" DO NOT USE! You will fill your engine with muck. Where do you think those dirt rods came from in Grimy's photos? Using non-additive oil. Link to comment Share on other sites More sharing options...
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