I expect that Aaron uses the Mobil One because of the danger of coking in a turbocharged engine. In a turbocharged engine, your choice is use synthetic, or allow the engine to idle a few minutes before shutdown after a hard run. Of course, using Mobil One AND idling a few minutes after a hard run doesn't hurt either.
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in