Do you think using the Gumout Fuel System Cleaner you mentioned is enough to clean out the carbon deposit, or do you think a more thorough cleaning like walnut blasting is still necessary?

Fuel system cleaner if pour in the fuel tank can only help clean the injector and internal combustion carbon a little.. But regarding valve carbon deposit wont be any impact if the engine is direct injection.. There is a way to clean is to spray the valve cleaner direct into the intake while the engine is running.

https://www.youtube.com/watch?v=7LOqO1iMmWw

NATES INTERACTIVE AUTO uploaded a lot of valve cleaning brands he tested using this method in Youtube. Is kinda risky but is the lowest cost for valve cleaning.

No, not enough because for GDI engine, the fuel doesn't pass thru the intake! So this fuel cleaners only cleans everything else but not the intake valves.

Good info, thanks mate

is250 manage to tried with 1 used car.. superb handling..

what type of absorber IS using ?

Ok laa.. If want to talk about best handling in class is still behind the German ultimate driving machine..
But still consider one of the best around due to sportier set up and large sport rim..

If got chance try to test drive the older Toyota/Lexus Altezza/RS200 (BEAMS + 6-speed manual) is even more better in term of agility & fun to drive factor compare to XE20/30 later IS250 & above..

The XE30 handled better than the F30, but the latest G20 is another step forward.

Lexus IS is an excellent car, underrated.

But too pricey in Malaysia

This post has been edited by jamespaul: Jan 15 2020, 11:51 AM

Kayaba electronic damper.

u check the price for the absorber ?

Around rm700-800/pc if not mistaken.

Hi, can comment of certain garages able to recondition the old absorber as brand new.

Price about 50-60% cheaper vs buy new absorber. Just that dont know if it is reliable

i think recon absorber is better for used car dealer

Used car dealer will go for the cheapest route. Mostly parts is from half-cut area or cheap oem/imiatation parts... If really no choice only go for re-con or absorber fix.. I have most of my rides fixed by local absorber specialist (TKA Motorsport), no issue until today and even more better due to customization to suit the requirement of the driver..

For stock electronic dampers I think better not recondition. If normal or adjustable then can try places like DPuncak in Puncak Jalil.

If you buy this car,

1. Go to workshop ask them to clean your intake valves.
They will remove intake manifold, depending if they not using walnut then use chemicals to soak the valves, slowly dilute the carbon build up, then scrape away.

2. Replace fuel filter (will get clogged if never change before)
3. Do engine flush
4. Pour in Gumout so that it can clean the injectors.

The question is how often are you expected to do:
Item 1: Every 5 years or 90,000km?
Item 2: Every 180,000 km?
Item 3: I dont think this is required anymore? in today's engines, if one uses synthetics?
Item 4: Once every 10,000 km?

if you want to have new car feeling


1. my engine is direct injection, NA
i seen other ppl same car as mine open up at 30,000km already caked up with carbon at intake valves.
If you have turbo or frequently pedal hard your carbon build up will be more as gas escape through PCV.

Suggest to add oil catch can after you do chemical/walnut blast.
to maintain it just spray throttle body cleaner everytime service at 10,000km.

- mine do the same as above, but i spray at smaller interval (5,000km), just small amount because just want to maintain good throttle response. now i use threebond foam
maybe sensors got dirty, at 5,000km engine will only pull if i step hard.


2. fuel filter better every 100,000km replace it.

3. no matter synthetics or not will build sludge, just takes how long only.
maybe once a year flush will do.

4. once a year will do, if added oil catch can and got spray little throttle body cleaning foam

This post has been edited by AllnGap: Jan 16 2020, 08:09 AM

gulp.. harga tahun bila ..🙈

IS250 with OCT.. ada tempat ke dalam enjin bay.. semua penuh.. 😭