I have a 2020 Eco with 34K miles on it. I changed the oil about 4,000 miles ago and it has gone through about a 1/2 quart since the change. I have had the truck for about 12k miles and have not had to add any oil until now. There are no drips on the floor where I park the truck and I didn't see any oil on the engine itself. Is this normal? Or am I starting with a problem? Any insight on this would be great. I have had 2 Cummins over the past 18 years and have never added oil once to them.