I have an 04 Dutchstar with a cat 3126 engine producing 330 hp. My oil capacity is 20 qts. and I have added a Lucas Oil Additive with every oil change for the last 5 years. I also use Rotella 15-40 for my oil change. Not sure if it just a good feeling or if it actually improves performance, the coach seems to be running better every time out. The ratio I use is 4 qts Lucas to 16 qts Rotella or 20% per fill. I currently have 55,000 miles on the coach and my gas mileage is 9.5 miles per Imperial Gallon based on a running record over the last 25,000 miles. I also pull a 2010 Ford Edge as my toad. Just food for thought........
