Hi, girlfriend has a 2019 Octavia 1.5 TSi Estate. Bought from Marshalls as an ex-Skoda UK fleet car with about 12000 miles. Had it 18 months and now at 30700 miles the car has asked for a service. It had extended warranty which I'm not sure whether or not has run out now but as she plans to keep it a while we're not so bothered about dealer servicing and I have always serviced our own vehicles as I have more confidence in my ability than most dealers. I keep all receipts and sign and date them with the milage when the parts were fitted (since they don't bother to give you a service book now). So, I have just serviced the car with the same Castol Edge Long Lifer 5W-30 VW 504 00/507 00 we've used for top-up, Mahle Oil Filter, Air Filter and Pollen Filter (the air filter was fairly clean, pollen filter which came out was pretty filthy and probably never been changed - so much for main dealer service). I'll probably wait till next service to change the spark plugs.
My question though is this: It went 18700 miles without asking for a service, but now that I have serviced it, it tells me oil change due in 9400 miles. So has it now changed itself to fixed rather than variable servicing and does it have to be plugged in (via OBD) to maintain it as variable?