I have done the service on ALL the two- and four-wheeled vehicles in this family. Have not had one warranty claim on anything except one GM rebranded car (Chevy Spark made by Daewoo) which is no longer in this family. All scoots, Yamaha, Genuine Buddy and Kymco have had zero warranty issues ... well, except the "Stall of Shame" stuck vent valve I keep harping about but I took care of those. I used to keep receipts for oil and filters but stopped doing that. I DO keep a maintenance log in the "notes" section of the operator's manual. Date, miles, what done, products used and part numbers (like HF566 and Wix 1053, etc.). The Kymco manufacturing is top notch. So is KIA. I would just do it and not worry about it. You will do a better job than most dealer techs anyway, unless you previously stripped every bolt you touched! Har, har!