as salam,
that'w why some of the very2 good and quality engine oil has state in the packaging "EXTENDED OIL DRAIN"/ EXTENDED DRAIN OIL"....

even they have the testimonial....

if one want to sure about it, after certain thou KM, take some sample of your EO, then go for LAB TEST to get a result of acid,oxidation, zddp, VI value, alkali and so on.....

sarjantulang

Sure sure! let me monitor the oil from time to time. Haha
Haha i know where you are coming from but i can't help it when it see the blardy full syn oil selling at RM80. I even drain my current semi oil at 3.5k just to test out this tesco fully syn. lol

If car manual say to change every 5000-km, doesn't matter whether it is Mineral or Semi or Fully Sync, all have to be changed at 5000-km. No exception.

If car manual say to change every 5000-km, doesn't matter whether it is Mineral or Semi or Fully Sync, all have to be changed at 5000-km. No exception.

One of the purpose of engine oil is to suspend the contaminants (eg. soot) produced during fuel combustion. Since a liter of Fully Synthetic can hold exactly the same amount of contaminants as a liter of Mineral Oil, both get saturated with contaminant at the same time, hence same oil change interval. To those who said FS can last longer is to say a gold bucket (more expensive) can hold more soil than a iron bucket of the same size is talking nonsense. That is defying physic and logic.

The theory is, once the oil poured out from container, they start to deteriorate regardless of whether you drive or not drive. Hence either 3  months or 5000-km etc.

IMO people are unnecessarily concerned about engine oil. As long as you use oil of the correct viscosity and grade and change at designated interval, your change of having engine oil related engine problem is as great as being hit by lightning. Meaning, extremely rare. And this is regardless of Mineral or Synthetic.

If using correct grade and viscosity, shouldn't happen. Something else must have caused that. Fake oil?

what I really seek is smoother engine and fuel economy (if possible )...

my friend suggested me to use the racing spec oil because it performed better and the price slightly higher than the normal SR1. which is why i'm asking the 'guru' here to get a 2nd opition...

the best way is to try out the oil itself...im trying different brand of engine oil to my car every oil change....

Bro, the Ceratec can be mixed with any engine oil? May I know where can I get this products? 

This is the part I never could understand.

If the surface is dry etc, you can make thing stick to the surface easy. But the inside of the engine are full of slippery oil and it is practically impossible to make anything stick to it unless under very high pressure or temperature of vacuum etc. So how does this ceratec manage to stick to the surface? Sounded more like voodoo magic to me.

Possible but unlikely. Engine and oil are designed to prevent that from happening in the 1st place.