Posted by sgtbull on November 22, 2011 at 12:28:23 from (163.191.228.254):
I've always heard that using detergent oil in a dirty engine that had previously not used detergent oil would cause serious problems.
I suspect most of the accumulated gunk that could break loose is inside the crankcase itself, in which case it would have to get though the pickup tube screen before it could go anywhere and cause damage. I'd think it unlikely that such small particles would end up blocking anything. Most likely, they'd end up in the bottom of the pan if they had any mass at all. I would however, take the pan off after a few oil changes and scrape out any buildup in the bottom and anything you can see/reach in the block and you should be good to go. In 26 yrs of working on old tractors, I've never heard of an actual case where detergent oil breaking loose old deposits ever caused engine damage/failure. I HAVE seen where chunks of silicone were stuck in the pickup tube screen, but even then, not to the extent it shut off or probably even notably reduced the oil flow. Does anyone else have DIRECT observations of problems associated to using detergent oil in a cruddy engine? (Not anecdotal, not "heard from a buddy", but actually SAW with your own eyes.)
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