You probably only notice it because you changed the oil again after going to the track?:D It kind of goes dark pretty easily even if driven normally. Used to worry me that only after one day of driving its darkened (even before the oil's fully run in) but now I think its normal.
Anyway for the price of Motul Chrono 300V, I think I might consider Redline Oils. Not sure which is better. I've used both, much of the same really!
Its overkill. Any synthetic oils no matter how good the base is, seems to start running a bit rougher after around 7000-8000kms for me. Like AARONNG said I'll rather change it more often but using a slightly cheaper one! Even if its mineral oil!

