[kz1000st]

I think many of the statements made by the author are sweeping generalities. I have 9,500 miles on my GY6 and it isn't burning oil or making rude noises. So I don't think the engines are inferior, just cheaply constructed.

Another thing I've noticed recently. While many people think the state of Chinese scooters is stagnation a strange thing has happened. Formerly GY6 engines were carrying designation 157QMJ or 1P57QMJ. I've noticed on a few spec charts the newer 150s are designated BN157QMJ and called GY7s.

http://bintelliscooters.com/product....lli+Fury+150cc

I don't know why the author chose to imply that Chinese scooters were made from cheap scrap metal but the idea that Petro based oils better serve the engine is an interesting conjecture.