As the Figaro engine is of modern design I always use Shell V-Power Nitro+ petrol, it is more expensive than ordinary unleaded but I think it is worthwhile.
I have the cars serviced once a year when they have their MOT. I use Amsoil fully synthetic oil and an Amsoil filter.
This is more expensive than ordinary oil but the engine only uses a little over 3 litres so it is not that bad. I have never had to add oil between services.