jmill25 what mileage are you going to maintain the Fluids 2500/3500,if you want to only change it at Say 3500, you can use in the Primary only- Redline, or I use Amsoil 20/50 here in my shop and some oil schoolers like to bring their own OR some of the older bikes need different. NOW in my bikes I use Redline in my race bike 2009 XB 12R- and my Street 08/XB12R- Amsoil 75/90 full syn.,gear oil,3/4 of a quart, measured. Then Lucas stabilizer to top it off for ONE FULL quart. I don't get the hard clunking that a lot of the Buells do or the Bigger bikes that make the Horrible CLUNK, when shifting seems to really soften it down.Also Depends on the amount of wear(mileage)when you start using these products.It cost a little more but cheaper in the long run. Especially the repair areas. THE Engine I use 20/50 Amsoil- OR you can use 50w Castrol Syntec. I have an 2006 RC 51 that just loves the Syntec It's a V Twin as well and much Higher Revs. So far no problems on any of the bikes I own. Most of our Customers are a little squmish on some of the Newer products, so I just do the normal with them, and get them out the door. After all I do need the work! Opps did I Type that out loud.Try not to GO over 3500/miles at least on the Primary & Engine the Temperature is at times above 300 degrees and More. It Fries the primary fluid NO cooler for it .There are other choices as well. Maintain your bike and it should be fine.~Jimi [cool][up]