I use synthetic everywhere I can. Mobil Delvac-1 in the engine. Mobil synthetic ATF in the transmission. Redline synthetic in the differential (just changed this one yesterday). I hope my MB (and all my other vehicles, except the toyota camry) last forever. The cost for synthetic over standard oil isnt that much of an increase when I look at the cost of maintianing my current vehicles or the car payment on a new one. Synthetic doesnt add that much to that number, so I go synthetic.

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Matt
2003 Jetta Wagon TDI 145,000MI
1999.5 Jetta TDI 287,000MI
2001 Suzuki SV650S 26,000MI
2008 Yamaha Vino 125 11,000MI
http://www.crazymatt.org