My 01 VM diesel has 92k on the clock now, I run it on Shell V Power, even though it's like £1.35 a litre, the engine seems to love it, even with 4.5" lift Ponyracers Mil Spec winch bumper w/EP9 winch, 3.73 gears, and 31's, my dawg, wife, 2 kids and the trunk area full to the top with camping crap and toys, I STILL get 26-27 MPG, average. I'm happy with that so I'll not do this mod. I change the engine oil like every 2k, and use Castrol Magnatec and mopar filter. Look after the truck, and it will look after you right?.