Ok thanks all for the input. I shall try BHP 95 then. There  is one nearby my house.

Will update you guys next week after finishing current Petronas fuel.

Knocking was informed by CoSE that it's because of RON95... Should go away if you use RON97 because the SA said Campro is designed with use of RON97.. 

Haven't experience "weird metal scratching noise appear near Vvt pulley" so can't comment much..

I don't have such problem, I'm lucky I guess? 

still prefer old bunga raya rim..

anyway, tall boxy chassis is outdated already.

last time we always laugh at myvi even we had similar design because we had way better ride and handling where we can drive better and not turtle as easily..

but these days, the tall design really tak boleh pakai dy. suddenly makes iriz and this new facelift iriz look so so so outdated.

edit: im glad i went for myvi 2019 then.. before this i was deciding to get a 2nd car and it was between get back an iriz or go for new myvi. i was seriously considering waiting for this 2019 iriz but then i decided to just give new myvi a try instead..

Mine got when going up those ramp carparks..

The sound will come when engine below 2k rpm..

Those metal sound like driving old rusting falling apart cars right..

hey i have been battling this pinging sound since 2016. no solution until today.  Proton did update my ECU in Oct 2018, but it was temporary solution and came back after a week or two. I have also tried pumping in full BHP Ron97, but it doesn't improve much.

If anyone has any solution, please do let me know. Kind of getting sick of this pinging  sound, getting louder year by year.