You may wont to use different lubrificants, than you use in England. I live in a country where it gets as high as 45°C in summer, but in the mountains it drops to -15°C in winter, so I am forced to use high tech oil, as in extreme temperature differences, the oil viscosity (of the cheap stuff) changes and it's performance drops. I use Liqui Moly in my 200tdi and i'm very happy with it. If you use good quality oil, your gearbox (and anything else) should run fine.
You will need to take lots of oil with you, especially engine oil. Depending on diesel quality you will have to change engine oil more often. I do mine every 5000Km, but then again, i run it on every possible carp i can find. I always forget my Jerry Can
Get good filters. If you have a snorkel, get 2 spare air filters,if not take 3. Forget K&N, they will kill your engine. Take spare oil filters and anything you need to fit them.
Diesel quality isn't the best where you intend to go, so it's a good idea to upgrade the fuel filter.
I use an UFI filter built for mining trucks, which is used by the army Defenders here in Albania. It's a straight fit, just a lot bigger. It will filter better and longer, and will keep your engine working fine. Search for something like that, but if you can't find it take more spare diesel filters.