I've been using Mobil 1 for quite some time already on both a proton and a perodua, feels really good, much better compared to other brands i feel, in terms of engine response and idling speed etc. Just a personal point of view. never actually tried castrol or shell before, so i cant help you there.

Guys, can you guys lemme know how much it is normally to change your car's air-cond tensioner belt if you guys changed before? I'm getting mine changed and i dont know what is the market price that SC normally charges... Thanks in advance!