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

Bel-Ray EXP Semi-Synthetic Ester Blend 10W-40 4T engine oil formulated for motorcycle wet-clutch engines with synthetic ester base stocks blended with select synthetics and petroleum components. Delivers high film strength and oxidation resistance across a wide temperature range.

Features

• Synthetic ester blend with select synthetic and petroleum components
• High film strength for improved component protection
• High viscosity index maintains stable film across temperature extremes
• Enhanced oxidation resistance for longer oil life
• Prolonged wet-clutch life with JASO MA2 registration
• API SN certified

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

Frequently Asked Questions

Is this oil safe for wet-clutch motorcycles?

Yes. JASO MA2 certification confirms this oil is formulated to protect wet clutches without friction-modifier slip.

What's the difference between this and full synthetic oil?

EXP Synthetic Ester Blend combines ester synthetics with petroleum base stocks for a balance of protection and cost compared to full synthetics.

What bikes does this work in?

Any 4-stroke motorcycle wet-clutch engine. Check your owner's manual for the recommended viscosity — this is 10W-40.

Does this oil need changing more or less often than conventional oil?

Semi-synthetic ester blends typically extend drain intervals compared to straight petroleum oil — follow your bike's service schedule.