Reddit reviews Motorex Power Synthetic 4T Oil - 10W50 - 4L. 405-400
We found 2 Reddit comments about Motorex Power Synthetic 4T Oil - 10W50 - 4L. 405-400. Here are the top ones, ranked by their Reddit score.
Fully synthetic, high-performance 4-stroke oilProvides optimum protection against engine wear under the most grueling, extreme temperature racing conditionsNo slipping of the wet clutchExtreme temperature and shear protectionNo moly additives
Motorex Power Synthetic 4T Oil - 10W50 - 4L. 405-400 https://www.amazon.com/dp/B000WKLJNK/ref=cm_sw_r_cp_api_i_0er3CbYYNCYJ7
I haven't seen motorex under $15/L. See amazon powersportsuperstore.
Maybe if it's too much then, you could try T6 in a rc390. My singles are pretty high strung, so I don't risk it. But rc390 is a tamer street bike.