Bel-Ray EXS Full Synthetic Ester 4T Engine Oil - SYN Ester OIL 10w40 4lt (4/Cas…

Bel-Ray EXS Full Synthetic Ester 4T engine oil in 10W40 viscosity, formulated with 100% synthetic ester base stocks for superior film strength and thermal stability. Meets API SN and JASO MA2 specifications for four-stroke motorcycle engines.

Features

• 100% synthetic ester base oils
• Superior film strength for component protection
• High viscosity index for temperature stability
• Exceptional shear stability to resist viscosity loss
• Reduced friction lowers engine operating temperature
• API SN and JASO MA2 certified

Specifications

• Brand: Bel-Ray
• Manufacturer Part #: 99161-B4LW
• UPC: 690509400052
• Viscosity: 10W40
• Quantity: 4 liters
• Weight: 7.94 lbs
• Package Dimensions: 10 in L × 8 in W × 4 in H

Frequently Asked Questions

What motorcycles can use this 10W40 oil?

This oil meets JASO MA2 spec for four-stroke motorcycle engines. Check your owner's manual for the correct viscosity and spec for your make and model.

Is this synthetic oil good for high-temperature riding?

Yes — the high viscosity index and synthetic ester formulation maintain film strength and protect viscosity even in sustained high-heat conditions.

Can I use this in a Harley or Indian?

Verify your bike's owner's manual for the required viscosity and API/JASO specification. Most modern cruisers accept 10W40 synthetics, but confirm before use.

How long can I go between oil changes with synthetic?

Follow your motorcycle manufacturer's recommended service interval. Synthetic oils typically extend drain intervals, but your bike's manual takes precedence.