I have a 1999 Porsche 911 C2 Cab 3.4. I have recently ditched the non-FS Mobil 1 0w-40 which was in the crankcase for Castrol EDGE 0w-40 (which is already smoother and offering slightly higher idle oil pressure at operating temp). However, I am seeing that the KV100 of these 0w-40 oils seems to...
