“目前，隻有mobile1 是合成油" - 不要以訛傳訛

http://forums.maxima.org/fluids-lubricants/573176-penzoil-platinum.html
M1 share has steadily decreased since they moved their regular M1 (not the extended M1 which has some Grp4) to Grp3 base stock. PP uses better Grp3 base stock, no arguing here, UOAs are the best answer to who is better. Check them out on BITOG UOA forums. PP is nailing M1 across a broad spectrum of vehicles.