10-09-2025, 11:28 AM
My gut instinct is nothing less than 15w40 as an all around weather lubricant. Since it is a rear engine in a confined space, the heat would keep me from thinking about anything less than that weight. 5w40 seems a very light weight oil for that stout engine. Your best info would be to look at what Cat recommends.
--Simon
1993 8v92TA #312