1994-1998 5.9L 12V Cummins

Doc's Diesel 1994-1998 5.9L 12V Cummins Parts

Legends Aren't Maintained by Luck.

Ask any diesel person to name the most legendary engine ever dropped in a pickup, and the second-gen 12-valve Cummins comes up before they finish thinking. The 1994-1998 5.9L earned its million-mile reputation the honest way—but here's what the legend leaves out: every one of those million-mile engines got there on clean oil, clean fuel, and owners who never skipped a service. Doc's stocks the parts that keep the story going.

Parts Worthy of the 12-Valve.

Oil filters, fuel filters, and air filters matched to your second-gen, plus heavy-duty diesel oil and fuel treatments that put back the lubricity modern ULSD stripped out—protection an engine from the mechanical era was never designed to live without. Simple engine, simple needs, no excuse to feed it junk parts.

Built to OEM Specs. Backed by the Doc's Fitment Guarantee.

Everything here meets or exceeds OEM design, fit, and function, backed by our Fitment Guarantee: if it doesn't fit your truck, we'll make it right. No guesswork. No BS.

Doc's Makes It Easy.

Enter your year in our Vehicle Selection Tool and we'll show you exactly what fits. High-mileage 12-valves reward shorter intervals—clean oil every 5,000 miles is the cheapest longevity plan ever invented.

Free Shipping on All U.S. Orders $99+

Grab filters and a season of fuel treatment in one order—everything over $99 ships free anywhere in the U.S. The 12-valve made the reputation. You keep it.