Mitsubishi Engine Oil 5W40 1L - RM209 They don't even let me bring my own oil.

I dunno who makes the engine oil for Mitsubishi. But there are engine oils that cost so much. BUT usually the brands are almost unheard off or mostly used by continental cars. But for your case u could either stick to it as i see it is actually no different to outside price for RRP pricing of engine oils. Unless u compare to everything that is being discounted.

Air Filter - RM143.90 WTF so expensive for paper filter?

Again same case like engine oil. Could be made by some expensive brand renamed to Mitsubishi. But this u could skip getting it from them because already proven super brands does not promise drastic performance increase. U could buy OEM replacements and still have same functionality.

Oil system cleaner - RM45.00 What is this?

I believe this is engine oil flushing. Basically they run a machine that circulates an engine flushing agent for 15 minutes or more that carries carbon or waste before filling with clean engine oil. Not a lot of shops have this machine or does this. But if it is additives like X1R and such, then it is a rip off. U can decline this.

Optional CVT flashing - RM300.18 What is this?

This could be re calibrating the CVT ECU. Yes there are cars with separate ECU for engine and gearbox. That could mean changing the CVT gear change to rpm map. It might probably be an upgrade to fix errors in firmware. Cars nowdays are like computers. U can issue patches. But by right such patches should be issued free and not borned by the customer if it does prove that doing so improves the car. But u know la, if its not about safety but performance, they will charge u.

This post has been edited by netmatrix: Nov 10 2013, 01:48 AM