Thread: 30w oil
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Old 02-06-2019, 12:59 AM   #5
40 Deluxe
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Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,038
Default Re: 30w oil

Originally Posted by sinbad339 View Post
I use Shell Rotella 30W diesel oil; the previousowner mentioned that the zinc in the oil helps with the babbit bearings.
Zinc is a type of extreme pressure additive to prevent/reduce cam lobe/lifter wear in engines with high valve spring pressure. It had nothing to do with Babbitt bearings. Not needed there.
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