How much oil does the new 6.7 diesel hold and how much does the gas engine hold. Also where is the best place for filters for the diesel. Just trying to compare some maintinece costs. I do oil changes and other maintenece myself. I have a large boat with 2 diesels and a generator so i know my maintinence as i do all the work on these. They are Caterpillars and the filters for these seem to be cheaper than the 6.7.