Thanks Jack. I think I'm going to stick with the Pennzoil Platinum Euro. Its base oil is made from cleaner natural gas rather than Mobil 1's base oil which is made from crude oil. Crude oil would obviously not be as clean. It's also approved for MB (226.5, 229.3 and 229.5), Audi (VW 502 00/505 00), and BMW, et al. I used to use Mobil 1 in everything and did for decades, but my crossfires seem to run smoother with the Pennzoil Platinum Euro. I guess I'd recommend it over Mobil 1 now. Pizzaguy says most here in the forum have gone to a 5W-40 viscosity as is the current MB recommendation, so maybe at my next oil change I'll try that rather than the 0W-40 in the Pennzoil Platinum Euro. Also, I can get that for as little as $29 for a 5 qt jug online with free shipping. My original post was asking if anyone could argue for a better oil than the Pennzoil, and the answer seems to be 'no'.