got a 172 mk2 and got the sevice done for free when i bought it. it had done 6500 miles but by the time the service was done it was at 10000 miles due to my driving to scotland and back a few times when i got it. Should i service it at 22000 miles or wait till the 24000, bit worried about the time for the major at 36000. If i service it at 22000 then it will need a service at 2k earlier etc