Oil Information

Oil Information

The 'liners have a wet clutch and the manufacturer suggestion is 20w-40 (based on the owner's manual). However, the OEM oil is "Yamalube Semi-Synthetic 20w-50" (http://www.starmotorcycles.com/star/yamalube.aspx), and is not offered in a 20w-40.

Like other vehicles, other oils can be used. The key with the wet clutch is look for oils which are NOT "energy conserving". (You will find that any mufti-viscosity oil with a 2nd # of 40 weight or higher will NOT be energy conserving, and is therefore acceptable in wet clutch applications).

Here are some of the other oils used by members of the forum:

• Amsoil V-Twin 20w-50
• Mobil 1 V-Twin 20w-50
• Shell Rotella T
• Lucas High Performance Synthetic SAE 20W/50 Motorcycle Oil

The latest consensus is that the semi-synthetic "Yamalube" 20w-50 is the best oil for general use. The motor appears to be quieter with this oil.

There have been some complaints of more engine noise with Amsoil and Mobil 1.

More information about this topic may be found at http://en.wikipedia.org/wiki/Motorcycle_oil.