according to the instructions in D.I.Y., you suck the oil out. Does this mean that there is no drain plug on the bottom of the oil pan that I can use to drain the oil to a drain pan?

There IS a drain plug.

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'96 E 3 2 0 (W 2 1 0) M 1 0 4 (Totalled)
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use the drain plug, you will first need to remove the plastic cover. your oil filter cap is clearly visibly from the top of the engine bay, towards the cabin.

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1997 E420