RE: 120hp Lehman lube
We should ask FF about Delo100. I think that is one of the non-detergent oils and Shell could be marketing a non-detergent oil also and you may have been using that. I'll bet if you switched back to the 30W all would be well** ...at least for some time. I use Delo 30W and 40W. I'd use Shell if it were widely available here in Alaska but it is not. Delo 100 30W is (I think) mostly for Detroit Diesels and not much else and I don't know if Shell has a comparable product. I think viscosity improver's are better now but it could be that 10W40 oil is 10W oil with the VI added so when or if (more like when I think) the VI wears out the oil will be 10W again and when running at cruise all warmed up I'd say 10W oil is not viscous enough. I know that the VI stuff makes oil more viscous*** ...not less.
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