Well as the title states my 06 VW GLI with 12k miles consumes a little GC at the rate of approx 1/3 quart every 2k miles. I realize that this is not an unusual amount of consumption, but what bothers me is that I really need to watch my oil level when using GC. My car did not use any Syntec 5w40 over the 3k miles I used it. So here are my questions: Which 5w40 should I use? a. Castrol Syntec 5w40 b. Valvoline Synpower 5w40 c. Mobil 1 0w40 d. Mobil 1 Truck 5w40 (Where can you find the new stuff here in the southeast?) Why am I seeing consumption with GC.... it's not really much lighter than the 40 weight? Thanks in advance for your thoughts.