Re: rotella 15-40 in an H

Posted by Bob Kerr on May 21, 2007 at 07:27:18 from (152.163.100.197):

In Reply to: rotella 15-40 in an H posted by RMO/MN on May 19, 2007 at 21:02:40:

I would suspect that if it wasn't leaking before using rotella, that the high detergent of that oil cleaned off the crank or even the seal of some old pariffin and caused the leak. if it did do that the seal if it was in good shape should squeeze it self back down to the crank, but I bet the seal is hard a a rock. I do know that Rotella is rated as a deisel oil and does have a very high ratio of detergent to keep deisel soot suspended so the filter can trap it and not have a ton of sludge build up in the pan. On the very old engines that did not have filters part of the maintenance was to drop the pan and clean it every so often say once or twice a year and they did not have detergent oil then so the crud would settle out overnight. when filters were added they needed the detergent to act as a suspension agent to let the filter trap the crud and not create sludge. if your H has never been rebuilt or has an older rebuild, I would stay away from the high detergent oils made for deisels. I would also change the front seal since I would suspect it is older and has "taken a set". If you rebuild the whole engine then the high detergent oils are fine, but not really nessesary on a gas engine.

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