Doc's Diesel DEF System KitDocs Diesel DEF System Kit: Protect your SCR system and keep your truck running smoothly with the Docs Diesel DEF Treatment Kit, the perfect combination for maintaining a clean, efficient DEF system. This kit pairs high purity DEF Fluid with our DEF Guard Additive to deliver maximum protection and performance. The DEF Guard Additive helps prevent DEF crystallization that can clog the DEF filter, trigger fault codes, and lead to costly derates. By

Rev up your style with our tough

Fleece-lined hood

7L Cummins engines (1989–2024)

Doc's Diesel 15W-40 Full Synthetic Heavy Duty Diesel Oil is specially engineered for today’s hard-working diesel engines - whether you're running a new emissions-compliant rig or keeping an older workhorse in the game

Doc's Front and Rear Brake Pads and Rotors Kit delivers ultimate braking power and ensures durability for heavy-duty diesel trucks

w/ Link Coil Susp

Versatile compatibility with DEXRON III and earlier fluids

water-resistant formula that prevents wear

Doc's Ram 5

It dissolves harmful gum and varnish on transmission components

Reduces coefficient of friction

you can safely add it between oil changes if performance starts to feel rough or noisy