greg keep us up to date on how you do with the 07 ml
i have an 08 and have not had any big issues with it

bought it with 99,000 a year and a half ago
it is my back up car, have put 26,000 on it i think

mine did have the power steering issue replaced/fixed before i bought it and i few other things that were good repairs to have done and they were done under warranty with mb

did my homework before buying and knew it was a good thing that some of that stuff had been upgraded/replaced

i have had to do some oil hoses, the plastic part that holds the turbo inlet orange gasket was cracked and i replaced that- pricey
if you have any oil leaks i would start there, pull the whole thing out and check it over good, we could not see this from the top
i insisted the mechanic pull it all out and it was badly cracked on the bottom, but i think that entire piece has been upgraded now- hopefully i will have no more problems with it

no more oil leaks since then
mine has not had the oil cooler leak yet

i get 28.5-30 every tank - summer and winter
that is babying the gas pedal some

it has done awesome in the mud for me on my dirt road to my house, that is why i bought it

so far my truck has been very reliable, other than the small oil leaks no problems

i am not a huge fan of the way it rides, changed the shocks/struts and it may have helped a little but did not think it rode much better
just a little harsh and too truck like for me

other than that have been very happy

good luck with yours

__________________
Courtney
2006 E320 CDI
2008 ML320 CDI