That car engine does't need expensive full synth oil like Liqui Moly. Just buy whatever branded full synth on promotion in Giant/Tesco/AEON like Shell/Castrol/Mobil/Mitsu Eneos, more than enough.

Bro the engine is the least of your worries, the engine is normally the most robust part of the car... just use any good oil and follow proper maintenance is ok already.
It's the other parts connected to the engine which most likely kaput first.

To me the cooling system is more important than the engine oil..  engine can run even if oil leaking... but coolant leaking, bye-bye engine.

My cars are 13 years and 8 years old respectively, no worries on the engine.. other parts hard to say, see luck.

That car engine does't need expensive full synth oil like Liqui Moly. Just buy whatever branded full synth on promotion in Giant/Tesco/AEON like Shell/Castrol/Mobil/Mitsu Eneos, more than enough.

Haha ok its up to you lor, coz its your money anyway. Using such expensive oil on your engine is actually a waste of money, just like using RON 97 on a Myvi for example. Also if you buy from reputable sellers, it will be genuine oil. Liqui Moly also only sold in independent workshops so there's no guarantee they don't sell fakes. If you really want to spend that much though, might as well buy Amsoil, more proven. Price might be slightly cheaper but maybe a bit more difficult to find.

Btw, for engine oil, the best choice is Petronas Syntium 800 10W-40 (Synthetic blend).
This is the engine oil recommended by Proton. It may be slightly thick but it suits the Campro engine. 

campro engine roar is loud as they want to mimic sport cars ala Lotus Gen2 (1st campro engine car). There's no engine oil can reduce as much as 10dB, except do loads of soundproofing

strange, that manual must be from Campro CPS variant, as that time CPS engine oil recommended 10W30 while legacy Campro specify 20W50.

is yours Persona SV (Sacrificed Value)? Maybe later batch they just share same engine oil spec in manual with CPS CFE variant

Engine sound rough, is inherent in the engine and its parts, nothing to do with the oil.

Since, the Persona is not a high performance car, right spec Mineral oil will do. Any oil with XXw-40 will do. Change it according to Proton's recommended interval, every 6 months or 10k km.

If you want better protection, for the occasional, sprint, semi synthetics would be better.

Synthetic oil is overkill for a Proton. But, if you have a lot of money or if company is paying for maintenance, synthetics.

Are u a rookie car owner?

Shell helix fully all the way. Gaint promotion sell at 99.90 or 129. Laat time gaint offer 99.90 i sapu 4 bottles. Can tahan a year or 2. Lol confirm ori also