The fact is all the oil companies play this labeling game. Once class III was made synthetic by some ruling all the oil companies started substituting it for IV and V with ever more vague labeling. Some of the synthetics oils still actually contain a portion of group IV and a few even a little group V. These oils and their ingredients change fast. M1 is the biggest violator on this ingredient merry-go-round. It is hard to keep up as this shell game makes these corporations money be they American or German. At least the labeling laws in Germany won't let the oil companies call group III full synthetic. This isn't a knock on group III oils. I just want some transparency when plunking down my money. The only places that seems transparent with their descriptions nowadays are Ravenol ,MPT and Red Line, although Red Line leaves something to be desired by making it seem their oils are majority ester based when they are not. The rest are dizzying in their lack of information and suggestive labeling.