Old Geezer - many thanks for the links to the owners booklets for both scooters! I had tried to find them online with no success.
So it shows that the GT200i needs oil & trans fluid replacements every 3,000 miles (5,000 km) and valve adjustments at 10,000 miles.
While the S250 requires oil changes at 1,250 miles (2,000 km) and gear oil replacements every 3,450 miles (4,000 km); and valve adjustments at 3,450 miles intervals - which means more than twice as often as the GT200i.
Unfortunately, I cannot do my own maintenance - besides having a very bad back and can't remain in one position for long or bend/squat for even less time, I also do not have any mechanical ability whatsoever; have no tools (& wouldn't know how to use them if I did); and after three surgeries on my right hand (was my strong hand) it now has very little flexibility or gripping strength.
So the dealer gets alot of money from me for service work and modifications. Luckily, on both my Silverwing (now gone) and my Burg 400, no repairs have been needed. The service intervals on my Burg are longer than on either of the Kymco's.
I'm waiting for a call back from the dealer as to how much they charge for service on the two Kymco's. Should be interesting and might cause me to re-think this purchase.