What Zen mentioned on servicing is the correct way to remove any minor sludge builtup. Since we don't know if sludge has been formed, we can only assume so, since you exceeded the recommended change by 3x. Don't know what type of damage has been done to your engine, as your detergent, protection, anti-wear and whatever protective addictives your EO has was long gone.

Try to go for SN rate lube now coz SN rated usually has higher level of detergent addictives than SM rate ones. However that is subjective has some good brands rated at SM has exceeded SM requirement in one of more of the addictives. SN rated just makes sure the min. addictives is higher than that of SM.

Higher detergent addictives would be preferable to desludge your engine gradually, if any. Change to branded semi EO (preferable SN rated) and new oil filter, then check your EO every 1K-2K usage. Makes sure you check while engine is cold (b4 you start your car).  Use the dipstick and drip it on a paper. Spread the oil, if its still watery, ok, continue using. Even if it is dark in color but still translucent (can see thru even if it's dark in color), can continue using.

If it started to turn honey (sticky) and/or so black that you cannot see thru it anymore. Then change EO AND OIL FILTER (yes, even if its only 1K-2K mileage), coz that is sludge forming or the contaminant leftover is so heavy, the current lube might exceeded its suspension capacity. It might be costly to change it so early but if the symptom is as mentioned, you have no choice, that's the price to pay for skipping lube change ON SEMI LUBE by 3 times its life capacity. If its fully syn, some more boleh tahan, but semi change schedule is the same as normal dino lube.

Continue using semi (NOT FS) for the next few services (35K, 40K, 45K) at the least and change accordingly at 5K service interval to continue cleaning the engine. A good lube will slowly desludge the engine if sludge has formed. DO NOT used any ENGINE FLUSH to desludge. Just on time engine oil change

FYI Havoline semi is rated SN at RM104.

Where got so complicated, fuel gauge follow the float in the fuel tank nia  Sometimes naik bukit or turun bukit or cornering also will affect fuel reading.

He changed his oil ady.. For a 15k mileage oil it seems to be quite ok.. No sludging, but overall the oil flows a bit thickly..

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Added on December 3, 2012, 2:46 pm

IMO, our fuel needle follows our driving pattern one. In another word, predictive rather than actual fuel level is displayed. So if we tekan kau kau, your fuel needle will go low and will finish fast. However if we change our driving pattern to light footed driving, it will then slowly rise coz it predict based on the CURRENT driving pattern, your fuel will last longer, so the earlier predicted fuel range is change from low to high, thus it goes up.

So far this is the only car I've seen that are doing that......maybe other proton also but definitely not wira.

Just starting buildup only, lucky him...

That is WHAT other cars fuel gauge did but proton needle was screwed, on highway, do hard driving, the fuel gauge will drop like shit, then do light driving, after a while, it will goes up again....on a flat highway...I have seen no other car with this kind of gauging....

Lolz, either the float is screwed, or the engineers at Proton too much time, go and program some sort of remaining fuel calculator into the ECU 

So now you can refer to the fuel gauge as "distance remaining" instead of "fuel remaining" 

I think proton engineers is trying out its hidden function that double as ECO driving gauge.....drive economically, reward, tambah fuel.....drive like perut sakit rushing to toilet...deduct more fuel that you usually has...

Next breed of eco driving hybrid evolution to proton high tech coming...

BULK FOR PERSONA CABIN FILTER (PATCO/SANDEN). Closing at 30th November 2012

Price : 3 pcs : RM12, 6 pcs : RM10.50, >10 pcs : RM 9.50 9 per pc. 
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Mau satu boleh?

I think proton engineers is trying out its hidden function that double as ECO driving gauge.....drive economically, reward, tambah fuel.....drive like perut sakit rushing to toilet...deduct more fuel that you usually has...

Next breed of eco driving hybrid evolution to proton high tech coming...

Lolz, either the float is screwed, or the engineers at Proton too much time, go and program some sort of remaining fuel calculator into the ECU 

So now you can refer to the fuel gauge as "distance remaining" instead of "fuel remaining" 

tu la, install this and that in ECU, than ECU lag due to low RAM 

Mahu apa type? Postage or collect at TT?

Apa tahi yang awak cakap ni? 

i think his brain low ram or corrupted..

Need check later.. now heavy rain can't check.
TT bila?

bukanka ECU macam PC tapi untuk control keta 

Pronda Insight mari

bukanka ECU macam PC tapi untuk control keta