Here's a picture of mine before I replaced the breather hoses.
Remove the air cleaner first (3 nuts). That's the oil dipstick you see. If you're taking yours out, check the condition of the two hoses connected to it.
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino