well i decied to read up about putting semi or full synthetic in my bike even though it only has 1000km on it, here is what i found on the Mobil website:
Q: Are there advantages to using synthetic oil in a motorcycle?
A: ExxonMobil® offers three Mobil 1 fully synthetic motor oils for motorcycles. Although Mobil 1 15W-50 has been used in 4-cycle motorcycle engines, ExxonMobil engineers recommend using Mobil 1 Motorcycle Oils, since they have been specifically optimized for motorcycle applications. Be sure to follow your owner's manual for recommended oil and filter change frequencies.
Q: Can different synthetic motor oils be mixed together?
A: Mobil 1 with SuperSyn™ is fully compatible with conventional motor oils, semi-synthetic motor oils and other synthetic motor oils, should it be necessary to mix them. But the superior performance of Mobil 1 with SuperSyn™ will be reduced by diluting it.
Q: Okay. Let's start with Mobil 1 MX4T. What does it offer that Mobil 1 for cars doesn't?
A: Mobil 1 MX4T is designed for sport bikes. Most of these bikes have multi-cylinder/multi-valve engines and use a common sump, which means the engine oil lubricates the engine, transmission and wet clutch. So unlike Mobil 1 for cars, Mobil 1 MX4T has no friction modifiers, which could lead to clutch slippage.
The motorcycle oil also has more phosphorus/zinc for enhanced wear protection at high engine speeds and high loads. Remember, most bikes don’t have catalytic converters, so higher levels of phosphorus are not a problem.
In addition, Mobil 1 MX4T uses different dispersant/detergent technology for better high-temperature performance and engine cleanliness. Mobil 1 MX4T is also offered in a different viscosity grade than Mobil 1 for passenger cars.
MYTH: You should break in your engine with conventional oil, then switch to Mobil 1.
REALITY: You can start using Mobil 1 with SuperSyn™ in new vehicles at any time, even in brand-new vehicles. In fact, Mobil 1 with SuperSyn™ is original equipment (it is installed at the factory) in:
All Porsche vehicles
Mercedes-Benz AMG vehicles
Ford Mustang Cobra R
All Aston Martin cars
One of the myths that persists about Mobil 1 is that new engines require a break-in period with conventional oil. Current engine manufacturing technology does not require this break-in period. As indicated by the decisions of the engineers who design these high-performance cars, Mobil 1 with SuperSyn™ can be used in an engine from the day you drive the car off the showroom floor.
more info available here http://www.prod.mobil1.com/index.jsp
so i guess i can put full or semi synth in my bike at only 1000km without any problems. i guess the next question is if its worth the extra money for the "motorcycle" oil or not, and which brand to use Mobil or Motul. also, who sells the Mobil stuff...i have only seen the 15w50 at wal-mart or canadian tire but my bike manual says to use 10w40