So I changed the oil in an engine that takes 5W-20 that calls for 5.5 qts. But only 2 Qts come out... no leaks.
What is the thickest engine oil you would recommend to me that won't reduce fuel efficiency that will help with the oil consumption.
Maybe use the high mileage type oil.
Any oil treatment additives anyone has had any luck with. Truck has 125K miles on it