ahhh.
when I was driving my car registration had to be valid in my home country other wise i HAD to import the car and pay the hefty fees and deal with the paper work. because my car papers where valid it was 45 minutes at the borders and no issues.
Registration (log book) must be current, and preferably in your own name as whilst in most countries it is possible to use a vehicle registered in another name accompanied by a letter of permission (translated to the relevant language), a copy of named owners passport and all vehicle documents it causes massive headaches and delays. I've done it several times in Africa with company owned vehicles and once made it across the Sahara from UK to The Gambia in an old Mercedes van using an out of date road tax reminder, in someone else's name, as the log book! Long story and the log book was rediscovered on our last day in Gambia Life is a lot easier with all paperwork present and up to date but anything is possible in Africa