I prefer the amsoil 0W30 motor oil, it lasts longer and provides slightly better gas milleage and is better in very hot or cold climates. I also use there ATF in the trans and severe gear 75W90 in the rearend. When I did the compleat switch to all amsoil fluids in my F-350 diesel, I picked up just over 2 mpg and the engine oil (5W30 diesel oil) lasted much longer thanks to the amsoil by-pass filter. If anyone is interested in any of amsoil's products, I can get them for you much cheaper than retail. Just let me know what you want and provide a shipping address for the most accurate price.
HAD A 2003 2.3L, amsoil duel remote by-pass filters, amsoil pre-oiler, all amsoil lubricants in everything, gibson sidswept exhaust, hurst shifter, K/N fipk intake, roush front and rear sway bar kit, frozen rotors, hawk performance brake pads, flex-a-lite electric fan(FLX-180), bilstein shocks, suvlights headlight harness, piaa extreme white headlights, optima redtop, ta performance aluminum rear end girdle, limited slip rear carrier, stainless braided brakelines, bama tuner.