Most of the time, diesel is of good enough quality. At least if you choose to get fuell at branded stations whenever possible.
There's more chances of getting a good overlanding vehicle together if you buy a standard vehicle. Second hand there are good deals to be done on older Nissan Patrols and Landrover Discovery's. The Nissan probably being technically more robust, the LR better of road. There are loads of high-luxes driving around in Africa. I don't think it's the coolest Car, but it cerainly does the job.
Overlanding very seldom is about extreme off roading as you tend to see in magazines. Reasonable off road capabillities and robustness is what you're after, not extreme off road capabillities.
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