$150 oil changes? Gadzooks that's alot of money.
Is it because diesels use large amounts of oil, or specialty oil? Why so $$$?
Every change is 15 qts and I run 100% synthetic. Honestly since I change my oil at home it's probably closer to $100 with oil and filter.
It seems high but I have run the numbers vs conventional, it's actually a bit cheaper to run the synthetic. With running this oil and taking samples every change I am up to oil chage intervals of 12,000-14,000 miles. Depending on usage and idle time.