Duramax Lifetime Supporter
Join Date: Nov 2012
the factory filter is perfect if you keep a clean one on it and dont use any additives that are emulsifiers (suspend water in fuel like alcohol) you need a demulsifier that removes water in suspension in the fuel so the filter can remove it. also ulsd is low on lubricant so an additive may prove useful to help pistons in the pump and injectors, but water is the main culprit that causes corrossion. of course change oil to remove contaminats from crankcase, add a fuel stabalizer and run truck some over the winter to keep everthing lubed, and use a battery maintainer to save those expensive batteries.
2002 C3500 LB7 300,000 miles and going, all stock, used to pull horse trailer and work around farm.