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They say conventional oil starts breaking down at what 230-250°? Something like that anyways, so I usually use that as my reference. If the oils still able to lubricate it's not too hot. Oh and I run west too and even at 80k pounds and it 90+ degrees outside I've never had mine go above 175 on a longer pull and I have no cooler. I never did understand how using hot water was supposed to cool it.
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