Synthetic Oil for Euro

[aaronng]

Are u still using Castrol or changed to another brand in the 10W-30 grade?
Why or how do u describe (?? ) the 10W-30 being smoother than 0W-40 in the Euro Accord? I am about to try 0W-40 so some feedback would be good!

I'm still using Castrol Formula R. With the 0w-40, it was nice. I previously had Magnatec 10w-40 in it and when I switched to Formula R, it was a noticeable change. Engine was quieter too (of course, not as quiet as a CRV).

Then, I recently had my 1.5 year service and put in 5w-30 instead. The engine sounds louder now. The sound is coming from either the head or the injector area. But it is louder. It is smoother than 0w-40. The engine also revs harder at 5000-7000rpm.

I had used the 0w-40 for the track. And wow, after the track day, my oil level was still the same, and the colour was the same too, dark brown which turns to a dark golden colour as the oil layer thins out on the dip stick.

With the Mobil 1 10W-30 and tapping noise problem, I'm not sure if its because it doesn't produce enough of a protective film or something? But my idea shouldn't make sense either, because Mobil 1 is suppose to be very protective for moving parts and oil analysis shows this to be the case too. So really have no idea. But in certain cars like I said, the Mobil oil gets CONSUMED easily..

I'll keep this thread updated with my 5w-30 oil consumption. I think though that cars with larger gaps between the piston ring and cylinder require a thicker oil. For example, WRX uses 50 or 60 oil