Top overhaul only? I think around RM2k, the whole engine can be overhaul including piston ring as this is the main culprit engine oil makan besides valve seal..

Just test and find out yourself laa..

Ppl recommend for u, so buy and test it laa.. Not asking you to buy the whole Vanli.. haha..

I am one of the Lexus 5W-40 users, it help my Toyota Corolla AE111 to achieve even better FC woh (Previous using 10W-40 ELF semi)... But 1 thing i sure, is the oil easy to thin.. Especially around 5000km, the oil level will drop a bit below the Max level... By the way, my engine is 4A-GE 20V and i rev quite a lot.. It is a cheap fully syn oil, which i think is better compare to some semi-syn selling at the same price... Anyway, since it is so cheap.. I also change the oil around 7000km..

The reason why FC worsen, i believe your previous oil viscosity must be lower.. Coz i experience it when i help my sister P. Kelisa to change oil to Lexus 5W-40 (Ori is Petronas 5W-30) the car felt quite heavy a bit and the FC worsen..

Bro the numbers in front & back also got difference.. If not why put it? The front is for colder temp, while the back is for hotter temp.. So the more light the front number, the easier the car can start during cold (especially during morning) this will help your car to save fuel & protect it.. Go goggle it regarding the SAE oil viscosity number means...

This post has been edited by littlefire: Feb 25 2012, 11:05 AM

Bro, how u explain those hybrid is using now? If not mistaken 5w-20?!? Yes, the behind 1 higher is better to withstand the heat, but with proper engine cooling & filtering nowadays, most car manufacturer is using thinner oil (If not mistaken new Honda & Toyota normal cars mostly using 5W-30) to help improve fuel efficient..

As mention, the thinner the oil.. the more easier the oil can flow in the engine thus reduce friction.. The thicker oil may be good in protecting engine parts, but as we all know thinker oil is hard to flow compare to thinner oil and thus do you think the engine can move more freely compare to thinner oil?

I think Vervain has the explanation of why synthetic can last longer...

"Synthetic does not change their form/property as fast as mineral. That's why they will have a better OCI than others and cost more. Normally minerals cannot withstand heat too much or too long. They will turn into sludge fast."

But if your engine already have a lot of sludge & dirty, would recommend that you double up the OCI to reduce it.. try find those HD oil = High Detergent (Not Heavy
Duty as a lot of ppl tot... )

http://www.vw-resource.com/engine_oil.html#detergent

he "HD" designation used in describing motor oil stands for "High Detergent" (not Heavy Duty). High detergent oils (of which Castrol is one) help to wash the engine of crud and hold it in the oil so it gets removed with the oil change.

http://www.texlube.com/oilmyths.htm

Myth #8

There are two main reasons why vehicle manufacturers recommend thinner or lighter viscosity grades of motor oil. First, a gain in fuel economy can be achieved with lower viscosity oil

Second, thinner motor oil is essential for easy starting, particularly in cold weather, and for proper lubrication once the engine starts. Today's smaller engines have smaller clearances and tighter tolerances between moving parts, and there have been some instances where camshaft damage has occurred because of inadequate lubrication with higher viscosity grades in colder weather. Thinner oils, such as SAE 5W-30, will flow faster than heavier motor oils during start-up and initial engine operation and will help protect the engine from excessive wear.

Just read about it, why cars nowadays must use thinner viscosity motor oil...

This post has been edited by littlefire: Feb 25 2012, 04:51 PM

I have a few friends using the lexus oil in their 20V, seems no issue also... But all of us OCI quite early due to cheap oil, we mostly change it around 5000~7000km.

I believe the loud valve noise is the VVT sound.. Some of my 20V friends already change to TOM's aftermatket cam pulley which replace the VVT and totally no sound at all.. Mine 1 still intact, but previosly maybe i put Bardahl 1 fuel treatment be4, the ticking sound seems soften a bit and still acceptable to me laa.. Even i change from 10W-40 to 5W-40 it seems better.. (maybe the lub is more easy to flow into the VVT?)

What i felt after changing to thinner fully syn oil is that when the VVT kick in, you wont felt a sudden jerk but felt the engine more smooth..

By the way, dont use the wrong oil filter.. for 4A-GE, you will need to use the longer version of YZZE2 (Camry 2.0/2.4 AZ engine oil filter if not mistaken) filter and not the short 1..

Some info sharing, If you manage to get the original manual which i have, the recommended oil for 4A-GE is 5W-30 in Japan... While manual gear oil is 75W-90 GL4.. Auto if not mistaken mostly is DEXTRON 2/3 and not the newest 4! (Take out the Auto oil level indicator and u will see it..)

I have tested 5W-30 (Bardahl semi-syn) before, and the oil thin even faster that why i decided to use 10W-40 (Elf semi-syn) then now using 5W-40 (Lexus fully-syn).. But personally, if ur engine is still new and no issue, 5W-30 really is the best.. Pick-up & VVT kick in really very smooth & light..

This post has been edited by littlefire: Feb 28 2012, 08:51 AM

The short 1 is YZZE1, only suitable for Toyota Corolla (4A/5A-FE), Altis or Vios original engine only...

This post has been edited by littlefire: Feb 28 2012, 11:24 AM

I tot GTR R35 original recommended oil is Mobil 0W-40, heard would void the warranty if use others.. Oh wait.. Ur car is Re-con 1 izzit? Nice car u have..

Maybe his engine already very clean?