Hey everyone. After stumbling upon this forum referred from vwvortex.com I decided to give this stuff a try. I went out tonight and found quite a bit of this stuff around town. I bought 5qt of the M05. Along with this they had M04 all the way to M01. My question is can I mix the M04 and say a M03? Also, the M01 and M02 I believe have a different label than the newer ones, but I believe they still said made in Germany, so I take it that stuff is good as well. Anyways, any help would be appreciated.. Thanks!