0w-20 fully synthetic better

Tinner oil improves performance and FC slightly... But not sure with 1nzfe is designed for 20wt oil.

Oh found it, 20wt oil is suitable. For 10yrs old engine, you have to monitor the oil consumption. If 20wt oil resulting in excessive oil loss, you have to use 30wt.

40 if a lot of high RPM driving. 30 for regular use.

20 is thin like piss. And MY weather makes it worse. RIP engine longevity.

so far so good la...smooth engine start.
btw my vios is around 15 yo liao.
i bought it due to good review too .as long as the brand come with the API certification . i think should be fine.
i upgraded my plug to denso iridium plug too. what i havent done is to pour in a bottle of engine cleaning oil in my fuel tank.

It you want good and cheap oil, get penzoil.

Engine oil so cheap still wanna skimp...Janganlah...

Just get Petronas Syntium...or the Shell Helix Ultra at Tesco.

The best

Dunno la, this TS also never mention his car millage, how to help ? But here mostly lapsap.

Then u best to use 10w40 or 5w40

Did your engine consume EO ? If not can continue to use weighted 30 oil.

Vios is known to have engine oil consumption issue when the engine gets old..So 5w40 is recommended for your Vios.