We will be closed Monday May 30th in observance of Memorial Day, any orders placed after 11 am PST on Thursday May 25th will ship out on Tuesday May 31st.

Due to supply chain constraints, some orders are experiencing longer than normal lead times. Please understand that we are working diligently to fulfill orders as timely as possible. We appreciate your understanding and thank you for your business.

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V-Twin Primary Case Oil

V-Twin Primary Case Oil

Everyone thinks about the transmission side, but the clutch and primary chain need love, too.

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V-Twin Primary Case Oil

  • For 1984-to-present V-Twin American motorcycle engines, including Milwaukee-Eight, 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
  • Suitable for primary case in older British bikes
SKU: 42904
$18.93
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Full-synthetic formulations specific to the latest V-Twins, UTVs, ATVs and Sportbikes

Typical Properties

API Service Class GL-4
SAE Viscosity Grade (Gear Oil) 75W80
SAE Viscosity Grade (Motor Oil) 5W30
Vis @ 100°C, cSt 10.4
Vis @ 40°C, cSt 50.8
Viscosity Index 201
Pour Point, °C -50
Pour Point, °F -58
Brookfield Vis @ -40°C, P 120

Available Sizes

Quart 42904

Suitable replacement for:

API GL-4 / GL-3 / GL-1
SAE 75 / 80 / 75W80
SAE 30 / 5W30 / 10W30