My car, C Class Blue Efficiency is just over 5 years old. It is due for a service, but I have only done about 5K since the last service. Do I change the oil and filter myself, or pay a fortune for a service that at the end of the day will probably only be an oil and filter change? I know if I DIY it, it won't be recorded on Star, but in the scheme of things, will that really matter? Undecided.