10W-60 is too heavy for high reving engines. You should not use anything heavier than 0W-30. The heaviest you should go is 10W-40 to avoid straining the internal engine components at high rev. I guess when you converted your engine you don't get the Mivec manual that says only use 0W-30 engine oil. Same as all the VTEC engines, light oil is best and less stress.

I saw another forum, they all recommend Mobil,
For me, I just don't wan cheap oil, n not heavy....any recommendation?
I rev high once in a while, maybe once a week, or twice a month to maintain the power.....
I prefer better torque...any idea?

i've checked AMSOIL, 20W50 also got 'racing'
https://www.amsoil.com/storefront/SearchRes...px?CategoryID=2

MOTUL.. both 20W60 n 15W50 also got competition/racing name
http://www.motul.com.my/product_line_up/4s.../4stroke01.html

im not sure if this is purely advertising but there must be reason why all of them using the name performance/racing etc on thick oil.. hmmmmm
nontheless, couldnt find any article related

nope, im definitely not that type of driver n definitely not rich enough to own high end racing car like u do..
but i juz want full protection for my engine be it during low speed, or fast speed..
since u said 10W40 is good enough for my car, maybe i'll try it next change
thankz for all the sarcastic remark btw

SEAL OF APPROVAL

As engine technology is involving faster and faster, carmakers are often tempted to write their demand into their certification specs. These demands cover a number of fiels, including lubrification.

To earn certification, lubricants have to fulfil international standards - mainly those issued by ACEA (the European Automobile Manufacturers Association ) and API (the American Petroleum Institute) - as well as manufacturer-specific standards. BMW's successive certifications specs, for instance, have stretched oil-change intervals substancially over recent years: from 10,000 to 15,000 km for the BMW Special Oil standard; 30,000 for the BMW Long Life 1998 (LL-98) standard; and more than 30,000 km for the BMW Long Life 2001 (LL-01) standard, of which the fuel-economy version (LL-01 FE) is a niche certification as it only applies to one engine.

thankz for the informative reply
btw, what car are u using? i think xW30 is toooo light for my engine ler XD

okie....thanks for the advice.....

oil filter for carens is rated at 10k km interval....