I'm looking for oil recommendations for my mildly modified K20A3. Stock rev limit is 6800rpms and mine has been raised to 7700rpms. Stock oil recommendation is 5w20, but the K20A2 (stock rev limit of 8100) calls for a 5w30 oil. I figure that a heavy Xw20 or light Xw30 would be best. The two that I'm looking at are Motul 8100 0w30 and Redline 5w20. The Motul is 9.5 at 100C, 167 VI, -71F, 432F and 11.2 TBN. The Redline is 9.1 at 100C, 145 VI, -49F, 484F and 10.0 TBN. It also has a 3.3 HTHS and 8% NOACK. I've tried GC and it's too thick.