Not servicing at proton?

Engine Oil - Liqui Moly? Torco? Castrol? - RM100 ~ RM200 depending on whether it's semi-synthetic or fully. Can ask kennywee92 for Torco / Liqui Moly engine oils. Otherwise can give Tesco a visit to see if they have offers for fully synthetic oils like Castrol Edge.

Oil Filter - Proton original (blue color) - RM10 ~ RM15

Drain Plug Gasket - Spare parts shop - Should be a few ringgit only. Ask workshop to give and they'll chop you with their price. I got charged RM15 cause abah insist don't need to change so he didn't buy.

Spark Plug - Proton original or Bosch Platinum Iridium Fusion from Lowyat member "airline" - Expected to be around RM100++ for the latter.

Gear Oil - Auto Gear? Proton-Petronas XP3 ATF or Proton SPIII ATF or Mitsubishi Diaqueen SPIII. For XP3 ATF I believe you need to flush your gearbox with it first before topping it up, which can be quite expensive. Proton SPIII around RM15 ~ RM25 per litre from spare parts shop. Not sure about XP3 and Mitsubishi SPIII ATF.

Brake Fluid - Bosch Dot 4 Brake Fluid, from airline also. 1L RM20. Should be more than enough unless you want to flush the brake system, which I'm not sure will take how much.

Air Filter - Proton original or whatever filter from spare parts shop? Expected to be RM10 ~ RM20

Radiator Coolant - Not clear on the brands available. I use Castrol Radicool, costed RM60 for 2L from Eneos 1U, but there are probably better places to buy it from. 2L should be enough. You might want to add some cash for RO bottled water (RM1.8 per 1.5L from places like 7-Eleven or some sundry shop) to top the radiator up with to prevent rust. Maybe radiator flush too (RM10+-) to make way for the new radiator coolant.

Fuel Filter - 60K KM, but if you insist, it's RM40 ~ RM70 depending on where you buy (spare parts shop or proton)

Add-on: Power steering fluid, Dexron II or Dexron III. 1L or less should be enough for flushing and topping up.

Go back to SC service need to use all their parts. Else they make remark. Warranty void.