You still need to run a good additive in your diesel. the main reason is for algae growth....Yes, algae. if you store it for a long time, it will be the diesels worst enemy. It will plug your filter, hurt your pump and cause havoc with the injectors. I would run a good filter system and extra lift pump, Something like an Air Dog or other brand. It will help in keeping the main injector pump fed with good clean fuel. Some of the diesel weren't turbo'd, they were N/A. I still think you can find kits for them, but the price might be prohibitive. Since the Dmax came out, the older diesels are getting very hard to find and sourcing good parts for them is also harder than for the Dmax. I have a Denali, and I have been thinking of a Dmax conversion for a long time. But it would be cheaper for me to go and find a nice 2500 club cab short box and put nice canopy on it. The early Dmax had some injector issues along with the injector pump. Again a good quality AirDog system would help extend the life of them. Also, there are just a bunch more parts and go fast goodies for the Dmax. Just food for thought.