I just inherited a 80 VW Rabbit pick-up that is a Diesel. The truck had been sitting in a field for about 7 years. I brought it home on a trailer and hooked a battery to it and it fired up on the first try. I live in Northern California and we have the low sulfur fuel out here. My question is, do I need to or should I run some kind of additive in the fuel? I have read that the low sulfur blend can be hard on the older engines, especially the injector pumps themselves. If I should run an additive, what would you guys suggest? Thanks.