I have an 06 Workhorse 8.1 I have been running 5 30 Valvoline I have 55.000 miles now and was wondering If I should change to 10 30 or go to Mobil 1 or just stay with what I have been doing ! I live ...
I run the 5-30 as the manufacturer recommends. The only thing I did change was the oil filter. I went from the 1/2 quart filter to the 2 quart filter. This gives me an extra 1 1/2 quart oil capacity, which helps to keep things a little cooler but it also gives me 4 times the filter capacity, which can't be a bad thing.