I'm thinking Mountain Dew from an American youth and Prestone from a '98 Dodge Caravan and petrol from, maybe, a Kymco, but probably not. Gasoline ain't oily unless you're riding a 2 stroke! And remember, one of the reasons you bought a LIKE was because it was aircooled and you no longer have to sweat the coolant leaks. (and the electronic fuel injection, dual disc brakes, dual rear shocks, etc.!)
I don't know, can you get a Mountain Dew in China? Maybe there's an old leaking can under your seat bucket left there by a fellow in the Kymco plant?
(I once found a Austrian beer bottle cap on the engine of my new, Austrian made, Volkswagen Vanagon. I know you can get a beer in the lunch room at a VW plant. I paid $18.5K for that bus, and was a little PO'd at first - then I laughed at the guy's sense of humor.)
Careful where you park, you get all that crap on your Kendas you'll have too much excitement pulling out of the lot!
I use a flash light, held away from the gas neck, to watch when filling. Easy does it - or. like one fellow suggested : get a gas can and fill your scoot at home when you can take your time. I did that for a time, then got tired of hauling around gas cans in a car.