Dayco Automatic Belt Tensioner 89392 Mineral MC-4ST 15W-50 is the superior

MC-4ST 15W-50 is the superior performance premium engine oil with 100% PAO & Ester

Flange to base: 41mm

less sludge formation and reduced piston deposits extending engine life

low braking noise and even greater resistance to brake fade at higher temperatures

Equivalent to Ryco RTK245

Dayco Automatic Belt Tensioner 89392 Mineral MC-4ST 15W-50 is the superiorDayco 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