I’ll let you know. It takes a while as it is a function of fuel consumed. I haven’t paid attention to mileage, but it was low about 700 miles after an oil change. They probably didn’t fill it up correctly, so I did. Since that time on the same oil change it has used a quart with almost no towing involved. I have an appointment tomorrow morning.
They start with a fresh oil change and verify that it is full. Then you track fuel consumed and oil used for X amount of fuel and miles. They have some limit they deem acceptable. I think it is a quart per 100 gallons of fuel. That works out to a quart per 1,000 to 1,300 miles at the mileage I get. Seems like a lot of oil to me. I believe the limit on the Duramax is the same. When it’s done I’ll try to remember to post here.
I’ve had a Duramax and a 6.0 and neither used any appreciable amount of oil.
Last edited by K1500; 03/28/23.
