“I decided to change to CFS 5w-40 NT as technical description seems even better than the oil I was using in my Alfa 156 1.8 ts and BMW K1200s 160 bhp model. Both fairly high revving. A higher viscosity oil is actually recommended in the Alfa however I prefer no too heavy an oil in high revving engines. I feel with CFS 5W-40 both vehicles seem to deliver a bit more power at higher rpm and run very smoothly. I have used high quality 5w-40 viscosity in all my vehicles over many years. I always run cold engines under light load until warmed up. I would empasise this is all based on my personal subjective experience. I am not making specific recommendations regarding other vehicles.”
