Well i got the diesel oil and tractor filter for the jeep 4.0L.... I still have a couple hundred miles left on my auto-rx treatment and then ill swap in the delvac 15w-40 and the new filter. Hoping for a higher warm idle and decrease in the rear main leakage. Sound like a plan? Im guessing this is a dino detergent oil and would be good for at least 3K miles?