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on a 80's Komatu D21 dozer (40 hp diesel), engine: Rotella T4 15w-40 transmission, bevel gear case, final drives, 10 rollers: Sinopec TO-4 SAE 30 2013 New Holland Boomer 30 tractor (28 hp diesel) with TRIAX Agra Plus ESP 15W-40 (because I got it free)

Interesting. chatgpt was telling me it has better extreme pressure behavior, so the top priority was the final drives, with transmission & bevel gears ("transfer case") as secondary priority. I'm not saying you're wrong, more mentionging that it appears chatgpt was wrong... So far I've...

yeah, so the first two replies are exactly the split I've seen elsewhere. What I’m curious about is the delta between old and modern SAE 30, specifically for this off-label use. I understand modern API SAE 30 is backward compatible for engines, but that doesn’t necessarily mean it’s equivalent...

I’ll soon be aquiring an early–mid 80’s Komatsu D21 dozer. The operator’s manual specs straight SAE 30 engine oil for the final drives and transmission. From what I’ve read, Caterpillar TO-4 has largely replaced engine oil in these types of applications. It seems like there are two common...