Dayco Automatic Belt Tensioner 89321 EV-Hybrid It improves the combustibility of

It improves the combustibility of diesel fuel providing increased power

Original Equipment Manufacturer (OEM) warranty

It contains a unique viscosity modifier for stay-in-grade performance for the life of the drain

Designed not to fling off in competition at high speeds or temperatures or attract excessive amounts of dirt / mud / sand when off road

Dayco Automatic Belt Tensioner 89321 EV-Hybrid It improves the combustibility ofDayco No Slack Automatic Belt Tensioner is designed to maintain constant tension on serpentine belt drives. The serpentine belt drives consist of a single belt that powers most, if not all, of the engine's accessories. To maintain the proper tension throughout the drive, an automatic, spring loaded tensioner is incorporated into the drive system geometry. Dayco's Automatic Belt Tensioner features a patented "flat spring" design that's engineered to