I might add that the Transalp is a very low stress engine that is quite tolerant to long service intervals. You should have no problem getting from Istanbul to Bangkok with minimal service. Get everything done in Turkey and you should only need an oil change or two on the way to Bangkok.
Like Simon said, Istanbul is your best bet for service and parts, you can contact the Turkey community for specifics. Ankara is very limited for parts and the dealers there have to order everything from Istanbul. If you can, have things done in Istanbul.
You should also have your tires replaced in Istanbul as well as you won't be able to find these easily along the way.
Best of luck, you have one of the most reliable overland bikes around...
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Dave
www.mototrekker.com
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