Petrol habish?

From the plug pictures, your engine seems to be in quite good condition for a 15 yr old car - no fouling from valve seal leak, the plug colour fits very well in those plug reading guides for good engine condition. Even your plug ground electrode shows timing heat marks (see attached).

good job DIY
consider replacing valve cover gasket as well

as for engine oil, can ignore the value before w, and yes xw40 is a very common viscosity for our 4g1x engine.
Proton originally specified xw50, Mitsubishi overseas specified xw30 with very old API rating, so i went with that

No need Can use any kinda oil, even minyak angin cap kapak also can use if jiu bai a vios

Would de-greasing the distributor and hosing it down with water jet be advisable? Opinions?

Consider degreaser on tissue/paper towel /cloth in smaller /diluted amount,  and then finish off with ipa (isopropyl alcohol)

Hmm Kent20 sounded familiar...

Anyways,  all I have to say is: you pay peanuts,  you get monkeys.
I need to replace my mid bullet and rear muffler but can't be bothered atm.

And lol my sister need to live with an ah beng exhaust 

um, if you only hunting for extractor, i guess can try powerzone...
everyone singing praises for their extractors haha

jedi_master sifu please comment

KYB gas/oil both for iswara also
Sachs for kancil however cant comment for iswara as never used on iswara lol

yeah powerzone extractor is proven stuff but if you want to feel more difference take the opportunity to change end to end exhaust. put one large s flow at the end enough, find a silent one cap ayam also ok. piping 1.8 inch should be fine. midbox no need la.. save money

Go no faster than 110 km/h – government mulling idea of installing speed limiting devices on all vehicles
Here’s something that’ll absolutely delight all you speedsters. Bernama reports that the government is mulling with the idea of installing speed limiting devices in all vehicles, “all” being an all-encompassing term here – think along the lines of passenger cars and motorcycles, not just commercial vehicles.

The proposal – aimed at being a measure to curb the growing number of road accidents and fatalities – would see a maximum speed of 110 km/h defined by the limiter, Deputy Minister of Science, Technology and Innovation Datuk Dr Abu Bakar Mohamad Diah said.

“Limiting the speed of all vehicles is a suitable method to reduce road accidents in the country,” he said, adding that it would be in line with the law in Malaysia to set a maximum speed limit of 110 km per hour. “If this can be implemented, then we will become the first country in the world to limit vehicle speed car based on speed limits in accordance with national law,” he told reporters at an event.

Abu Bakar said that the speed limiting device was easily available, and it can be installed on all vehicles, including motorcycles and imported cars. “The device, which can limit speed as required, costs less than RM500,” he added.

He said police patrol cars, ambulances, fire engines and vehicles from other appropriate law enforcement agencies would be exempt from these regulations.

==edit==
here is the link from Bernama. 
http://www.bernama.com/bernama/v8/bm/ge/ne....php?id=1114920

The dep. minister's statement about the cause of accidents and cheapness of the device etc is out-of-touch with the real world situation. It will go the way of the 3 blinking speed indicator lights fixed on top of heavy vehicles many many years back.

And if implemented will mean every vehicle owner have to fork out money to some govt.
approved agency to instal...

And besides the measures you mentioned, JPJ should go undercover and catch those reckless drivers on the road. Those dangerous drivers can cause serious damage even at less than half the 110 km/hr speed, and should face very heavy penalties...

afaik there is no difference. coz it cannot interchangeable.

tuning afaik he had increase to rm70. not sure he still do tuning though. u can watapps him at 0122687273
heard b4. jus make sure dat its not those swirl /twisted type...

seems like not bad. one guy reviewed the 4-1 long extractor before and gave it good reviews. give it a go!

Very pretty. Later karat liao bkam lidis

Disagreed I can scrape some rust, dilute it in a glass of water for you to drink, see whether placebo or not Engine is clean on a dirty engine bay can simply relate to recently engine blown, no money to transplant had to overhaul Besides, refer to my fuelly ady know ayam an FC oriented driver If it has to be related with TUNE, then it's an FC optimized tuned monster. Nothing related to performance