Which is the best for NIGERIAN use,fuel economy, engine problem,maintenance and so on, Audi A4 2002 model, Mercedes Benz C280, Toyota camry (big light/pencil light), Passat 2002/2000 Volkswagen ?pls kindly advice.

TOYOTA CAMRY, but much also has to do with your the health of the car you buy, driving skills, your maintainance culture, the kind of mechanics that treats ur ride, and the route the car will be plying.

I will also go for TOYOTA CAMRY  this one is best you feel yourself when you will use it , just go for a try,  test it ,