Hi Scotty, a Mercedes mechanic told me that it is ok to service my 2002 Mercedes C230 Kompressor (M111 engine) every 15000km or a year on synthetic oil. Considering it is an older Mercedes, I'm a little sceptical on whether the oil can last for a year. I do less than 5000km in a year. Do you think it is alright or should I just stick to the 6 months oil change interval?