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Red Line Oil 42804 Transmission Oil, V-Twin, Motorcycle, 75W90, Synthetic, 1 qt., Case of 12. Similar to Red Line's heavy ShockProof oil, V-twin transmission oil with ShockProof provides unequalled protection for both stock and aftermarket American V-twin transmissions. This product dampens transmission noise (reducing the notorious shifting "clunk" found in these gearboxes), dramatically reduces temperature, provides thicker oil films between gear teeth, and completely resists throw-off. Red Line V-twin transmission oil is compatible with petroleums and synthetics. Its viscosity characteristics produce a film thickness similar to a 75W250 grade, while providing the same low-fluid friction as an SAE 75W90.Features:* This product dampens transmission noise (reducing the notorious shifting clunk found in these gearboxes), dramatically reduces temperature, provides thicker oil films between gear teeth and resists throw-off* For all aftermarket versions like Baker, JIMS, S&S, etc.* For all H-D trans including with Evolution engines, Twin Cam engines, and latest 6-speed Cruise Drive* Same fluid as Red Line's unique Heavy ShockProof Gear OilNotes: Provides film thickness similar to 75W250 and fluid friction similar to 75W90.