Mobil 1 10W-30 is the factory fill, though you only find it at specialist garages, most of the UK Chrysler dealerships dont stock it, youll need about 10 litres of it with a filter change
cant help with the roof, only ever had a hardtop on my RT
190 is normal, the fan should be kicking in I guess by 210
our UK club site can be found at
www.ukviperclub.co.uk we've a forum as well