Three + gallons each oil change. But I have a remote dual filtration set up. The bypass and full flow filters take almost 3 qts to top off before I spin them on.

That friends is why I use a good synthetic. It's more expensive each time but I only do it annually with a filter change mid year. They say I could go a lot longer but I like getting under the hood and checking everything out at least the first good day in spring.

Find another shop or learn to do it yourself, it's pretty easy as suggested above. The Dodge dealership in town does diesel oil changes for $75.00...

I go 7,500 miles, Valvoline Premium Blue and a Baldwin filter unless the conditions get dry and dusty.....

All good advice above from the guys.