GC comes in only one weight - 0w30 (it's a thick 30, almost 40), being distributed exclusively through the AutoZone chain.
The bottle must read
"made in Germany" just above the bar code.
It is very easy to tell Green GC from Gold by reading the batch number which includes the date of production.
You can determine the date of manufacture by locating the fill code (batch number) on the bottom of the bottle.
For example, if you have M04023...., the "M" would represent the plant location.
The five digits '04023' represent the date of production.
The number 04 represents the last digit of the year (2004) and the '023' represents the day of the year, based on 365 calendar days, on which it was produced (January 23).
Therefore Batch # M040236ATW2418346 16:38
was manufactured on January 23rd of 2004.
The Green has stayed in production for several years - up until the very beginning of 2005.
The last known Green batch is M05010........
Everything newer (e.g. M05027......) is Gold.
Here is a good picture of the Green batch #:
[ October 30, 2005, 01:46 AM: Message edited by: vad ]