I just picked up some BMW 0W-40, but it doesn't say anywhere on the bottle that it's synthetic. It does say ACEA A3/B3/B4 and Quality Longlife-01. The back label is a fold-out and it basically stipulates: Top quality engine oil. Developed for your BMW. Tested by BMW. See the BMW service instructions for details of suitability for the engine. It has a warning that states: Contains Calcium sulphonate & Phenol, bis (1,1-dimethylethyl) dodecyl-. May produce an allergic reaction. Do these products make it a synthetic??? Is it even possible to make a 0w-40 conventional?