Welcome Kymco Owners!
I am not trying to be rude but if you would read the previous posts you would not have to ask the same questions that have been answered many times here . Just saying . Good luck .
On page 2 of the super 8 150 subsection there is a thread titled "oil change" where they say that the owners manual specifies 10w40 . Use your favorite brand . The motorcycle superstore usually has some good sales on tires . Good luck .
rear 120/80-14 . The bike Bandit has a selection .
Front and rear tires don't have to be the same brand. I have mixed tires on many bikes/scooters and never had a problem.I use shell Rotella oil in all my bikes & scooters. I recommend the 15w40 non synthetic until you have at least 1000 miles and then you can switch to the 5w40 full synthetic if you wish.And don't waste your money on premium gas.
If you are determined to find a specific brand of tire google the brand name and then search for the size . Good luck .
I think bike bandit had a michelin , pirelli , and a dunlop in your size , any of those should be good .