talking about the truck in my sig, ive noticed and its mentioned quite often on other forums, when checking the oil on the 4.0's, the oil is splotched all over the dipstick. capacity is 5.5 quarts, i changed my oil the other day with Mobil 1 Extended Performance 5W30, added 5 quarts, ran it, and checked it the next morning. some times the dipstick comes out clean, with a good reading, and sometimes splotchy. 5 quarts of M1 seems to put it at the full mark, while the Quaker State Ultimate Durability i used last time took 5-1/4 quarts to reach full. Should it be fine with just 5 quarts? I dont want to jeopardize my engine, the dipstick marking full when it could very well not be. I skipped out on my last 2 free oil changes at the dealer, they just put in a full 6 quarts and its way overffull, seems as they cant use half quarts. (stupid)