Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Starfire · Tools & Supplies
SFDEF2.5
In stock · ships from Knoxville
Starfire Diesel Exhaust Fluid (DEF) is a high-purity solution of 32.5% urea and 67.5% deionized water.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 1 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Universal fit
Compatible with all diesel engines that use an SCR system (heavy-duty trucks, buses, agricultural and construction equipment). Always fill the dedicated DEF tank – never add to diesel fuel.
Part data verified against 3 catalog sources
Numbers this part supersedes or interchanges with. Showing 1 of 1.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It is injected into the exhaust stream of diesel engines equipped with Selective Catalytic Reduction (SCR) systems to convert harmful nitrogen oxide (NOx) emissions into harmless nitrogen and water. You replace it as a routine maintenance fluid when the DEF tank level runs low. This 2.5-gallon container is a convenient size for topping off or small-fleet use.
Part Number: SFDEF2.5
STARFIRE, DIESEL EXHAUST FLUID 2.5
Dealer: KP Services Crossville
Compatibility, alternatives, and more