RE: 120hp Lehman lube
I use straight Delo 400 40 wt. in my Lehman 135, since I'm in a warm climate (Texas). The borg warner tranny will take ATF or straight 30 wt. When I had it rebuilt, I switched over to the ATF. 8KW Westerbeke genset takes straight 30 wt.
To simplify matters, the PO used straight 30 wt. in all three and that seemed fine at 4000+ hrs.
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