This morning's job was to change the oil and filters in my wife's 1.6 petrol engined Renault Kangoo MPV because the service light had been on for a few of days, at 18,000 miles from new.
The last oil change was done by a main agent dealer just before she bought the car a year ago with 6,500 miles on the clock. This means the oil I drained today has done just about 12,000 miles from that point. It came out chestnut brown, rather than black, which means the engine runs quite cleanly. I made a mental note at the time that it was quite clean and could have done a fair bit more mileage without detriment.
Having tidied up, the last part of the job was to reset the service indicator, which I just did. The on-board computer tells me the next oil service is due in 18,000 miles from now. This is confirmed by the service schedule in the maintenance record book. This is on mineral oil, there is no requirement for expensive synthetic oil in this engine. It's also obvious that the dealer knew about the advice given by Renault not to reset the service indicator if an intermediate oil change is done, the 18,000 miles stands.
I might do an intermediate oil change, after 9,000 miles, but there's probably no need.