A couple of years ago, (at 57,000 miles) mine were replaced. At the time I was burning about a quart every 600-700 as I recall. Problem was definitely solved.
I have not seen the low oil lamp since and no have had no need to add any between oil changes. (I now have 88,500 on the odo)

I did mine about 6k ago and I'm back to using/burning oil. Smoke at start up suggests exhaust guides. It was worth the try, but now its time to do the head.

Jorg

We are up to do ours too....
I have a valve spring compressor I used before, but its different to the ones I have seen for the job....
Its this one...
http://cgi.ebay.com/ebaymotors/VALVE-TOOL-SPRING-COMPRESSOR-INSTALLER-REMOVER-TOOLS_W0QQcmdZViewItemQQcategoryZ35625QQihZ007QQitemZ170051512622QQtcZphoto#ebayphotohosting

Do you guys think i can make it work?

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2009 Mercedes ML320 Bluetec

Not unless you remove the timing chain tensioner. Otherwise, you can damage the camshaft when you take the rocker towers off. I did mine with one like this:

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1989 300 SEL that mostly works, but needs TLC