cfs

Hi All, been looking at a few posts here and there relating to Millers CFS 10w40 on the net, regarding it as a good choice for fast road and track day use and also for engines with higher mileage. Its obviously a slightly thicker grade than 5w40 and many users have mentioned noticing less...

Righto... Can knackered coilpacks cause high cf's even there they havent gone...No codes,No misfires ect. I want to put my timing back to normal(way it was mapped on cupra_matts car) but i was gettin 11cf's at 6krpms,ive now knocked it back 0,75 and im gettin max of 5.4 ... What cause...