Bel-Ray EXP Semi-Synthetic Ester Blend 10W-40 4T Engine Oil - Harley & Indian V-Twin
About Bel-Ray
Bel-Ray has manufactured motorcycle lubricants since 1948, with V-twin specific engine, primary and transmission oils formulated for air-cooled operating temperatures.
Bel-Ray EXP Semi-Synthetic Ester Blend 10W-40 4T engine oil is engineered for the demands of high-performance motorcycle wet-clutch engines. This blend combines synthetic ester base stocks with select synthetics and petroleum components to deliver robust protection.
Why riders pick this
- Synthetic ester blend for enhanced protection
- High film strength guards engine components
- Stable viscosity across extreme temperatures
- Resists oxidation for extended oil life
- JASO MA2 certified for wet-clutch compatibility
This 10W-40 formulation is designed to maintain high film strength and oxidation resistance across a broad range of operating temperatures, ensuring consistent performance for your Harley-Davidson or Indian Motorcycle V-twin.
Optimized Engine and Clutch Protection
- Synthetic ester blend with select synthetic and petroleum components for balanced performance
- High film strength for enhanced component protection under stress
- High viscosity index maintains a stable oil film across temperature extremes
- Enhanced oxidation resistance contributes to longer oil life in hard-working engines
- Prolonged wet-clutch life with JASO MA2 registration to prevent slip
Built for the Road Ahead
Bel-Ray EXP Semi-Synthetic Ester Blend 10W-40 is a versatile choice for riders seeking a blend that offers both the protective qualities of synthetics and the proven performance of petroleum. It's an excellent option for daily riders and those who push their V-twin, providing reliable lubrication and clutch engagement without compromise.
Specifications
- Brand: Bel-Ray
- Manufacturer Part #: 99120-B1LW
- UPC: 690509200218
- Viscosity: 10W-40
- Type: Semi-Synthetic Ester Blend
- Weight: 2.1 lbs
- Dimensions: 8 in L × 4 in W × 2 in H
Common questions
Is this oil suitable for wet-clutch V-twin motorcycles?
Yes, Bel-Ray EXP is JASO MA2 certified, which means it is specifically formulated to protect wet clutches and ensure proper engagement without slipping.
What is the benefit of a semi-synthetic ester blend?
This blend combines the best attributes of synthetic esters with petroleum components, offering superior film strength and oxidation resistance while remaining compatible with a wide range of engine designs.
Does this oil maintain its viscosity under varying conditions?
Yes, it features a high viscosity index, which helps maintain a stable oil film and consistent performance across a wide range of operating temperatures, from cold starts to hot running.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Bel-Ray |
| TYPE | Chemicals |
| SKU | 840-1612 |
| WEIGHT | 2.1 lb |
