Fuel Filter change interval ?
Guys,
I learned the hard way that filters are cheaper than repairs. I limped into Lake Havasu City, towing a 14,000 lb fifth-wheel, thinking I might consider a new fuel filter. Turns out it was clogged, and the dealer's diesel specialist told me to change it at each oil change, as per the "Engine Oil Life Remaining" indicator on the truck. He said the Duramax runs a higher-than-normal fuel pressue system, and if there is a fuel pressure drop, the engine management system detects the corresponding drop in fuel volume, and puts the engine into "limp" mode, keeping you down to under 2,000 rpm. Protects the engine (and GM's warranty budget).
I like the idea of bulk-buying filters; cheaper to change it out early than having the dealer diagnosing some 'running problem" !