Red Line Synthetic oil Synthetic oil Oil Primary Case full-Synthetic V-Twin engines Fits: > All Bigtwin Evo Twincam an M8 primairy
For 1984-to-present V-Twin American motorcycle engines, including Evolution, Twin Cam, and aftermarket engines of similar design
Same fluid as our famous MTL gear oil
Improves clutch operation while reducing wear and temperature
Where most synthetics are too slippery for clutch operation, this friction-balanced product is balanced to provide less slip, smoother operation, and helps to apply more power in modified engines
This product is for use in the primary chaincase with wet-diaphragm spring clutches.
This product's balanced friction and light viscosity provides excellent clutch operation with low drag for reduced power losses—the fluid is a 70W80 GL-4 gear oil, but it features the stable ester base stocks that ensure consistent film strength over a wide range of temperatures.
Simply put: Don't lug your bike if you want to keep the primary chain and clutch in order. In 2007, the 96-inch engines started coming with a spring-loaded, automatic chain tensioner. When lugged, this design can combine with the bike’s tall gear ratio to ratchet the chain too tight, causing heat-soaked parts to wear—here, we hope you’ve switched to a our Primary Case fluid.
part numbers
- 42934: V-Twin Primary Case Oil
