Hello all, First, I am already aware that this topic has been discussed long ago and I have read all posts. However my question is that will it be really better to use A3B4 instead of C3 for minimizing the oil consumption? Currently switched the oil from vw504 (liqui moly 4200 5w30) to the vw502 oil (Castrol Edge 5w40 still C3) and the consumption got even worse despite increasing the viscocity. I am really struggling to find the A3B4 5w40 oil with peace of mind as nearly nowhere sells this and I can not trust to the genuinity of the oils that I find from small shops who are not global in any way. I would like to read your opinions about this oil (Castrol Edge 5w40 C3) with Vw502 approval on my 2010 audi 1.8 tfsi (cdhb engine). Cheers.