Change oil in w126

[Snibble]

My engine is different than the other 126's and I would like to know how is the proper way to change the oil in my 126. I am not sure when it was last changed and I am taking a big risk in not changing it yet.

So.. I would like to know what filter I should purchase, and tools required. Then I would like to know where the oil filter actually is located. And how I take care of the old oil, as in... how do I remove it. Is there a plug somewhere on the bottom that drains it all out? or what? I did a search on the topic but found an article on changing the oil in a different engine.

thank you