My wife owns a 2008 Smart fourbytwo cabrio and is thinking of taking up the Mercedes servicing offer, which constitutes one A and one B service over a period of two years. The cost works out at £480 over a period of two years, paid monthly. She does around 6000 miles annually, and I was wondering if you consider the deal worth taking up. The other option is to have a service every two years and to change the oil and filter yearly.