Duke,
Great article. From what you wrote it seems reasonable to use a CJ-4 oil instead of synthetic Mobil 1 in the 3.2 liter engine in my 1999 clk320, and the only ill effect would be a miniscule reduction in the oil company's earnings

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)