aeon topvalu fully synthetic 5w40 i bought RM99 last time..
it was locally blended oil listed under API official licensee directory. you may ask "can trust or not? boleh pakai? will my engine kaboom?", well, it's up to you..
https://engineoil.api.org/Directory/EolcsRe...dName%3Dtopvalu

but i don't know if your engine condition still good enough (no oil leak, no oil consumption) to take fully synthetic and lower viscosity oil. If engine condition already bad and use those oil without rajin to check oil dipstick, you may end up with less engine oil and having risk of car breakdown on roadside...

Expect oil leak occur on oil seal area, piston ring let more oil escape into combustion camber and burn together with air fuel mixture... What engine oil you have been using all this while? Any oil consumption or oil leak?

If you observe proton subforum, there are iriz owners using petronas syn7000 fully synthetic oil at proton SC, around RM250~270 if not mistaken.

Last time we see petronas fully synthetic rm200 already say it's super expensive.... Now rm270 still got people support... Future selling rm350 also no problem... As long got AMG Hamilton image sure bagus can support one.