Bel-Ray EXP Semi-Synthetic Ester Blend 4T Engine Oil - Semi-SYN Ester OIL 10w40…

Bel-Ray EXP is a semi-synthetic ester blend 4T engine oil formulated for air-cooled and liquid-cooled motorcycle engines. The ester base provides superior film strength and oxidation resistance while maintaining stable viscosity across a wide temperature range, ideal for both cruisers and sport bikes.

Features

• Synthetic ester blend with select synthetics and petroleum components
• High film strength for improved component protection
• High viscosity index for stable performance across temperature extremes
• Improved oxidation resistance extends oil life
• Prolonged wet clutch life on friction-plate designs
• API SN and JASO MA2 certified

Specifications

• Brand: Bel-Ray
• Manufacturer Part #: 99120-B4LW
• UPC: 690509200225
• Viscosity Grade: 10W-40
• Type: Semi-Synthetic Ester Blend
• API Rating: SN
• JASO Rating: MA2
• Weight: 8.02 lbs

Frequently Asked Questions

What type of engines can use this oil?

Bel-Ray EXP 10W-40 is designed for 4-stroke motorcycle engines in both air-cooled and liquid-cooled applications, including cruisers and sport bikes.

Is this safe for wet-clutch motorcycles?

Yes — the formulation is specifically designed to prolong wet clutch life and prevent slippage on friction-plate clutches.

What certifications does this oil have?

It meets API SN specification and is registered to JASO MA2 standard for motorcycle engines.

Does this oil work in cold weather?

Yes — the 10W-40 grade and high viscosity index allow this oil to flow reliably in cold starts while maintaining film strength at operating temperature.