Just for interest...
Last week I did a compression test on my son's 1988 300TE.
It has 68000 miles on it.

1/ 180
2/ 180
3/ 185
4/ 185
5/ 195
6/ 190

I dont know what the compression ratio is on the 12valve 3.0 I6 but I thought these numbers were good bearing in mind the milage!!

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2009 Mercedes ML320 Bluetec