Hi ya,
Just sharing my experience.
Track car DC2 B18C-R engine
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I used to use Castrol RS 10w60 in both my track dc2 and Gti, as it was the lube my mech have been using without problems on race as they give plenty of protection when hot and reduction of blow-by coz it is thick.
Last year when i was more active in short races i noted engine response not as good as other competitor :), hence tried to go for other options and honda japan recommends 0w30, 0w40, 5w30 and 5w40.
Last year we saw many affordable oil at 5w40 and my instinct was to give a different grade oil a try. Then BP 5w40 was the most affordable. The lighter oil really increase my engine respond significantly and now i'm stuck on 5w40 grade oil for short races and qualifying but still 10w60 for long practice and long races.
Since track car, i change oil so often i just went for something easily available at good prices. Oil that i had used in 5w40 are BP, BHP and Castrol Edge.
Oil that i want to test and used next would be the Torco Sr-1 and Sr-5 5w40.
Road Car K20A-R
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The lube that came with the car from Japan for breaking-in engine was very light. Don't know what grade but it should be mineral oil either 0w30 or 5w30. Used the oil for almost 1050km.
On the 1st service, i requested oil change which was not in the service schedule. Drain that japan oil out and it was cooked probably due to my hard driving after the 1000km. :) It was black like kopi O.
Since under warranty, i just told them to put in OEM full-syn 5w40. When they pour them into my engine, i could see that the oil is pretty thick for a 5w40 unlike other brands that i had used. It look more like a 10w40 or 5w50.
The moment i drove out of the center, i regretted it already. At lower revs, the engine is not as responsive as before and when ivtec engage it smooth but it does not have that hard push to the backseat. A little disappointed if you ask me.
When for HPC event and after 20 mins non-stop hard driving and back to pit, i could here my engine tappets considerably louder. hai.... Blow-by was minimal if you ask me. But have to used it to 5000km for my 2nd service.
I had a chat with some K20A friends (not malaysian) and they told me to try 0w40 Mobil 1 from USA and Torco Sr-1 5w40.
Since i'm getting the USA Mobil 1 at good prices, i gave it a try last week.
My engine respond at low revs is all back like how it should have been from Japan. The transition from low revs to ivtec is very smooth and ivtec surge is strong again and car pulls really smooth now to redline.
I have just used the oil for 200+km now so i can't really comment the lifespan, blow-by or how it is when it is hot. But at this point of time, i just like it considering the price i pay for.
On of my other friend with a K24/K20 EP3 is using the Torco SR-5 5w40 and he swears by it as he said his engine is revving much easier with lower oil temps.
If you need to get the Torco oils to try or the Mobil 0w40 i testing now just PM me.
Hope my long-winded story helped. haha...
