I speak with no authority on this but lack of water cooling and cam/balance belt maintenance should reduce the running costs ? But all said and done there's probably not a lot in it. All old porker's cost a bit to keep going !
Thanks for the information, it is pretty much as I expected, I have been pretty fortunate with my 968 todate, it has only really needed servicing in the 2years I've had it, I have spent money on it but it wasn't necessary!