Well I have Amsoil filters and oil now in truck. I used to buy quality oil filter and ran Delo diesel oil from Walmart (cheapest). You should worry more about your fuel filter situation than oil. Good oil and filter and she will be happy, change every 10k or sooner. Now stock fuel filter is crap. Put aftermarket 2-3micron on it. 1 tank of crap fuel and you will spend 3-5k$ to repair....