Yeah you can generally get fully synthetic oil in iran, Pakistan, India and Nepal, although it is substantially more expensive than you may expect and you will have to really search it out at times. It took me nearly a day to locate some of the right quality in Quetta at the end of last year for example. As for octane boosters, probably would be good although how many can you actually carry, not enough i suspect, my KTM ran fine on the fuel available throughout the trip, although i have heard of others having some problems.
Hope this helps and have a good trip.
Some day so soon....