I just had the oil changed a week ago, 3K miles after the last one. According to the bill they at Firestone used Kendall GT1 10W30 full synthetic, I trusted them to have it right, now I need to check the manual.

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE