Chemicals & Fluids › Primary Oil Image 1 of 1 Primary Oil $11.99 Mineral-based motorcycle gear oilFormulated for use in high performance V-Twin transmissions and primary chain casesDesigned for all 1984 and newer Harley-Davidson® models with wet diaphragm spring clutchesShear-stable formula minimizes chain and gear wearEnsures optimal clutch engagement, prevents slippage and facilitates smooth shiftsExtends chain life by minimizing stretch and wear Quantity: Purchase Added! Mineral-based motorcycle gear oilFormulated for use in high performance V-Twin transmissions and primary chain casesDesigned for all 1984 and newer Harley-Davidson® models with wet diaphragm spring clutchesShear-stable formula minimizes chain and gear wearEnsures optimal clutch engagement, prevents slippage and facilitates smooth shiftsExtends chain life by minimizing stretch and wear