C'mon GC is everywhere! - none at AZ? I'm on the MA border and buy it all day long. Options: Mobil 1 High Mileage 10w30 is similar to GC then Mobil 1 0w-40 or any Euro A3/B3-4 5w-40 - but this may be too thick unless you are doing really hard towing. Also, I havent tried the new rotella T5 10w30 which is a real viable option. Also castrol SLX pro 5w30 at your VW dealer. Here are some spec on the SLX:
5w30
11.9 cst @100c
73.4 cst @40c
6130
3.5 HTHS at 150c
-42
PERFORMANCE LEVELS
Castrol SLX Professional LLIII Powerflow is recommended where the following current and
superseded specifications, performance levels and test methods are cited:
• European ACEA:
Petrol: A3
Diesel: B3, B4
• Motor Manufacturers -
Mercedes Benz: MB 229.51
VW/Audi: 504 00, 507 00
BMW: Longlife 04