Turbos usually have higher compression ratio. Which means it needs RON97 for optimum performance. You have been using RON95 for so long and it is starting to show from the engine as the knocking sensor is unable to work in combination with other sensors to adjust for the lower RON. Try RON97 and if it "cure" the engine knocking then you will need to continue using 97. Else you can find out one by one which part is not functioning properly and need to be changed. Perhaps even an engine overhaul.

turbo got higher compression? 

turbo causing the engine to work in high temperature easier
higher temperature causing low ron fuel easily to combust

maybe that's what he meant

turbo causing the engine to work in high temperature easier
higher temperature causing low ron fuel easily to combust

maybe that's what he meant

Sorry for misunderstanding. What I meant is cars with turbos usually have higher compression engine. Because the high compression combined with the turbo can produce high power output. Yes, you can run RON95 with it without issue. RON97 is more optimum.

https://dsportmag.com/the-tech/boost-vs-com...ssion-benefits/

Good read here.

that article is totally in the context of drag car racing

how is that even relevant in this topic? in fact , in modern car engine, turbocharging an engine has made high compression ratio unnecessary

Turbos usually have higher compression ratio. Which means it needs RON97 for optimum performance. You have been using RON95 for so long and it is starting to show from the engine as the knocking sensor is unable to work in combination with other sensors to adjust for the lower RON. Try RON97 and if it "cure" the engine knocking then you will need to continue using 97. Else you can find out one by one which part is not functioning properly and need to be changed. Perhaps even an engine overhaul.

Would like to find out if there is anyone who experienced your vehicle's engine showing a knocking sound during acceleration with Petronas Primax 95 fuel.

In my case, the knocking sound only happens with one car, the Proton Preve Turbo. It doesn't happen with other cars which include Ford Focus and Mazda CX5.

I am certain that it is fuel related because I hands been driving the Proton Preve Turbo for almost 6 years now. It first started to show knocking after about 1 year from new with Petronas fuel. At first I thought something wasn't right but after I switched to Caltex, the engine knocking sound was gone. I drove the car solely on Caltex for about 3 years and there was not a hint of the engine knocking. But lately I got a company petrol card so I started to switch to Petronas again. The moment I switched to Petronas, the knocking sound came back.

I suspect there is something with the Petronas fuel that is not very suitable for the Turbo engine of the Proton Preve. There is no issue at all with Caltex fuel .

Is there any other owner who made the same observation and if yes, what is your car? Fwiw there is no difference with the new Primax with Pro-drive formula as shown in another thread here. The knocking sound is still there.

I dun face any prolonged knocking with petronas fuel, but it somehow raised the working temp on my temp gauge. Just slightly more (say 2.5 notches) than any other brand of petrol (shell, caltex, bhp, petron at 2 notches) consistently and the effect is gone when i switched brand.

not sure if it is coz of my timing advance setting or what. std proton setting is 5deg btdc, i was told. i think mine is at 8deg btdc or more, set by my mech.

my car is wira 1.6.