None of the motorcycling outlets close to me have the oil that Bailey recommend for my Dragonfly engine, Castrol R4, as Castrol apparently did some deal with BMW, so that retailers can no longer get it. I thought I had been rather clever when research online turned up a 4 litre bottle of the stuff at RG Racing, but have since learned that they are out of stock and won't be able to get any more.
They say that the Castrol tech team recommend Power 1 10/40. I emailed Bruce at Bailey Aviation because I was worried that I couldn't find any 5W. They said, "you should be able to get the Castrol Power 1 Racing 4T oil, its still their current oil. 10W/40 is fine and we are actually trialling some 10W/60 oil also at present made by Putoline. The important part is that it must be fully synthetic".
So, I have ordered 4 litres of that, at the same price of £47 (incl postage) from Rob Willshire at RG Racing.
The spec sheet says:
Power 1 Racing 4T 10W-40 is fully synthetic 4-stroke engine oil for modern high performance sports bikes that increases engine acceleration and power right up to max rpm. Its Race Derived Technology based on Castrol's racing history and testing experience ensures maximum engine performance, without sacrificing engine
durability, thus giving a significant benefit over other types of engine oils.
Power 1 Racing 4T 10W-40's formula employs the very latest Trizone Technology™ for 4-stroke motorcycles, so as to give optimum protection of the engine, clutch and gears even under the most arduous riding conditions including sustained operation at high rpm.
Power 1 Racing 4T 10W-40 is suitable for all modern high performance motorcycle engines where API and or JASO specifications are recommended.