What should I be doing now to make sure it keeps going for a while yet?
Must admit im a waxoyl nutter and all my cars i go way way OTT with the stuff when i get them but i clean it all first as the prep is important imo. I also regular top it up a few years later. Its probably why after over 20 years of ownership my mk1 looks so good. My MOTer loves me due to the waxoyl Its a personal thing but when mk2 GTIs get near the milage you state because i have seen so many with oil pump failure around that miles i think i may change the pump on mine next year just for my own peace of mind nothing more. Also worth checking the last time the cambelt was done.