I have not been using the bus a lot-- only a couple of thousand miles in the two years since my last oil change. I generally do not pay much attention to the time factor on oil changes for my cars; I just go by mileage. This usually has me changing the oil once a year.
If I was going to take a long bus trip, I think I might prepare by doing an oil change anyway even though the current oil is still easily within its mileage life, but for my current use of 50-100 mile trips I don't feel it important. Also it should be noted that I have added several gallons of fresh oil since the last oil change anyway. Does this attitude make sense to you?
:o Oh boy just pull you a oil sample and see where the TBN is at you maybe good or maybe not,living where we do there is no worry about condensation
As long as I can drive the bus long enough to get the oil fully up to temp for a half hour, I'd call it good. I'm not changing the oil in my bus this year, anyway...
Brian
Consider me wasteful, but every 5000 miles my gets all new oil, a full lube, complete inspection including the air system and brakes, and (knock on wood) everything still looks new, inside and out mechanically.
I watched Arrow changing oil in one of their Setra and a MCI with the DD13 engine man times have changed a 35,000 mile oil change and the oil looked new like it never was used on engines with over 200,000 miles, I didn't care much for cartage type filters but they must work the 10 gals of oil was sure clean