With my 428's history of eating bearings and also the thrust bearing problem, after I got it all fixed I decided to switch to synthetic oil. Tougher film strength was the main reason without having to resort to very heavy oil. Using Mobile 1 10W30 I don't have any worse leakage problem than before, just a little weeping from the rear mail but my rope always leaked a little. Last filter inspection showed no signs of glitter.
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