This is a huge topic on every motorcycle forum. Synthetic or mineral? Semi-synthetic, perhaps? Synthetic is great in a bike with a dry sump like a Ducati. But with a wet sump (Yamahas) you can run into clutch trouble. I have never had any problems with synthetic oil though. I do know that you shouldn't switch around too much - especially with older bikes. I have used Mobil 1 alot and like it very much. The Castrol is good too. I don't think it is totally synthetic, but has a high enough percentage of synthetic that they can put it on the label. The Castrol is probably a great choice because it will give you the performance without hurting your clutch. Just make sure you buy motorcycle specific oil. That DOES make a difference.
Tracked down some Castrol R4 to buy, but I've been told by my Yamaha dealer that you should not use any synthetic base oils until at least 12,000 km are done.
Something to do with the liners in the cylinders. Aperently if you do use a synthetic to early, sometimes your R1 may start to burn oil (1L a week). If the 12,000km have not been clocked Yamaha will not repair the problem under warrenty.
They recomended Castrol Active4 or Motul 3000 (Mineral Based Oils Only). The dealer even pointed out that the users manual also states no oils containing anti-friction modifiers are to be used, Synthetic based oils such as Castrol R4, Mobil 1, Shell Advanced and so on all contain these modifiers.
Any feedback..........Has anyone else come accross this problem before.........
Yeah, you shouldn't use synthetic oil until 12,000 clicks. Otherwise you halt the motors break in. I broke my R1 in properly and didn't switch to synthetic until 15,000 km. Now my bike (at about 50,000 km) burns no oil between oil changes and when I had it dynoed (when it was stock) the operator said my bike was the strongest stock R1 he's ever seen. It's been completely reliable also....Except for that damn rear brake light
My "new" R1 doesn´t feel as strong as the "old" blue one I had. The blue one was thrashed from day one, while the red one was being ridden by an old lady to church on sundays, serviced with synthetic oils every time since new. The blue one felt... looser enginewise, while the "new" red/white one feels a bit weaker. I´ll use Castrol GPS semisynth from now on.
This oil topic is for the birds. There seems to be no firm right answer. Every theory seems to make sense about the oil. All I can hope for is that Santa will bring me a case of the right oil and a few spare filters to boot.