ML63 AMG buying advice and servicing

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Morning gents. I'm just doing my research before buying an ML63 AMG. My budget is up to a max of £20k so I'll be looking at 2007 models with around 60k miles on the clock. There doesn't seem to be much info around on these as they're a rare beastie.

I was wondering if there are any things I need to look out for (reliability wise) when going to look at one? Is it worth getting a Merc warranty (I believe Tier 1 is £1200 if less than 60k miles) or one from Warranty Direct?

What are the services intervals like and when are the big services due? I don't want to buy something and then realise it needs new spark plugs, transmission oil etc.

Many thanks for any help and tips :-)

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Great, thanks for the tips guys. They seem to be a rare beast so there's not too many up for sale in my price point. The ones for sale seem to habe been listed for quite a long time but sellers aren't keen to do a deal.