0W40 Full Synthetic

[Liquid Blue]

I've seen some posts where riders are saying they're losing 200-300 rpms from using a 0W40 rather than the OEM 0W30. I'd like to run a full synthetic (Amsoil Formula 4 stroke 0W40, or the new Yamalube 0W40) but I do not want to lose rpms. Anybody experience this issue? Thanks.

 

[Honk]

I don't believe it. How could it be?

 

[yamadog1]

oil

guys on here say you loose a bit of horse power, but i have never lost any rpms.

 

[fisch137]

I would sure like to know, just about ready to change oil. Just a tip...I have about 1500 mile on Blue Marble 0-40 wt. and I have never lost any rpms.
Thinking about using AMS oil 0-40 full synthetic next time.

 

[sleddheadd]

I've seen some posts where riders are saying they're losing 200-300 rpms from using a 0W40 rather than the OEM 0W30. I'd like to run a full synthetic (Amsoil Formula 4 stroke 0W40, or the new Yamalube 0W40) but I do not want to lose rpms. Anybody experience this issue? Thanks.

You may lose a little bit of speed but that can happen with several different condition changes also. trails are soft or hard,fresh snow, tempuature changes effect your engines perfomance, will you really notice 1 or 2 mph? I would rather go for the security of knowing the motor is protected the best it can be. If you are a racer and run on the same track,same conditions and change your oil every 3 or 4 races then go with a lighter wieght oil other wise stay with the protection of a quality oil designed for high performance, high rpm motors like the 4 strokes in our Yamahas. You will Not notice a difference in your rpms.