Thanks Guys!
I guessed it was oil being burned!
The plugs were bought from Phil!
Did we get the wrong ones?

Oil was 5/30, but we put in 20/50 this time.

Ok we just did a compression test with my Craftsman good quality gauge.
1/ 180
2/ 180
3/ 185
4/ 185
5/ 195
6/ 190

Would the oil leakage past the seals account for the hot misfire?

__________________
2009 Mercedes ML320 Bluetec