Well, now we know!

We did put 20/50 in this time, so that should help until we can get to it.
Is there any risk in leaving it for a month or so?

I saw that the stem seals can be done without pulling the head.
We seem to have a coolant weep from the back of the head, so I guess it would be best to replace the headgasket and all at once.
Anything else that you guys think we should cover if the head comes off?
Where can I find out if the valve guides will need doing ... is it obvious?

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2009 Mercedes ML320 Bluetec