Too many fake Castrol and even the spareparts shops can't tell the difference. That makes it very risky to get Castrol. I do not trust semi-synthetic oils as there's no fixed ratio on how much synthetic it has to be before it is considered as semi. Even with 10% synthetic, it is still considered as semi-syn.

It's not new. This has been a problem for a very long time now.

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.

Actually there is... the lighter the better coupled with high quality protection. Almost all engine manufacturers would recommend the lightest engine possible to ensure that the engine is not stressed and fuel consumption is improved. XW-30 and XW-40 series oil are the best for any car unless the engine seals are leaking due to wear and tear or age.

High displacement engines don't suffer that as much as high reving honda engines. The torque provided by those engines no longer make them high reving, as in high reving to produce the necessary power. The same can't be said for 2L high reving honda engines. Power comes only in the top end and 90% of the usable torque is only available above vtec range.

M3s, Ferraris and high displacement engines produce 90% of their usable torque between 3-6k of their RPM range. If you look back at BMWs history, they went from light Mobil engine oils to heavy Castrol engine oils, all due to 'business' relationships. Same goes for Ferrari and Mercedes and their 'associate' oil companies.

The protection properties of the engine oil is not directly related with its viscosity. Honda recommends it's own 0W30 or 10W30 engine oil for VTEC. Mitsubishi recommends the same for all of its engines, including the EVO. Subaru recommends 0W-30 too. Only time to use a slightly thicker engine oil like 10W-40 is when the car is used in very hot enviroment like deserts.

I guess their marketing department is doing their job if they got you to purchase the engine oil just because of the word sports. Castrol Edge cost more than Castrol Edge Sports. Castrol Edge Sports used to be known as Castrol RS and I've used it before. Power lost.. substantial.

Reason for sports use.. simple. When the car is used in the track, the engine temperature goes so high that it does not matter what viscosity you use, they all end up the same. It's so hot that they all end up like water, even with 10W-60, so it works just fine in Sports but not for street applications.

Try changing to a lighter engine oil and feel the difference. Then ask yourself a simple question. Why is does the engine feel heavier with the heavier oil? So much more resistance in the engine that it is felt by the driver.

Well, Edge Sports is good but not the best around. It's one of the cheapest fully synthetics around because it's not Ester based. The best ones around are Ester based. Also because they don't have proper distribution in Malaysia, there is too many fakes in the market. I've personally encountered the fake ones and lost about 1.5L in less in 1000km mileage. Took it out immediately and never use again. Furthermore I've been buying from the same shop without issues previously. Currently I'm using Petronas Syntium 5000 0W-30 and damn it is nice. I also chose it because I can get 5L packs (4+1) and that only their biggest petrol stations stock it. Furthermore it's one of the few companies that make the same grade with different viscosity.

This post has been edited by sleepwalker: Aug 19 2007, 08:50 PM

Motul Turbolight 4100 is okay. Very similar to Castrol Magnetec. I've not used Syntium 800 so I can't comment on it.

There is a reason for the price difference. Try lighter engine oils and it will even be more happy to rev.

I rev till 7k, even on 4th gear, and no problems. You're not the only one who revs that high. As for flush, they are not recommended as they leave behind harsh chemicals that's not good for the engine. There is no need to flush at all if the engine oil is changed every 3 months or 5000km.

The brand is called Q8. Top of their line is called Q8 Formula 1. Yes, it is getting difficult to source as it is expensive and not very well known here. My workshop still has a source for it.

Marketing. Why don't you check the oils from the largest Petroleum companies and they do not need to associate themselves with 'racing' or 'sports'. Well, at least I know that their marketing strategies are working on you.

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Added on August 21, 2007, 8:55 amThe only engine that cannot use full syn is the rotary engine from the Mazda RX series. All other engines can unless it has worn out seals. Get your foreman to explain why or else find another more reliable foreman.

This post has been edited by sleepwalker: Aug 21 2007, 08:55 AM

Not necessary unless you are driving a very old or worn-out engine.

He most probably think that by going full throttle for 20 seconds and shifting at from 2nd to 3rd at 7000 rpm is racing and that he needs to get engine oil that has the word 'Racing' or 'Sports' on it. I guess he's never tried pushing the car all out at 7000 rpm from 2nd gear to 4th gear and repeat that process 15 times in Sepang per lap for 30 laps.

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Added on August 21, 2007, 4:40 pmLIke I said before, if you take your car into the track, your 10W-60 engine oil will feel like 0W30 and will be the same like any other 0W30 engine oil. When you take the dip stick out, oil actually drips like water. So on heavier engine oils you can use it for racing without a problem but when you use it for street, the additional stress actually slows down the engine.

Anyway, go and list all the engine oils you want. I've used Castrol 10W-60 for some years believing that the extra heavy oil will help protect the engine but only to find out that Castrol RS (now Edge Sport) is not the best engine oils around. Its quality is about the same as expensive semi-syn. That was when i stopped using it.

This post has been edited by sleepwalker: Aug 21 2007, 04:40 PM

You're welcome..