I think you can simply replace that seal at the bottom of the dipstick tube. As for the "gold" color, how much of the engine appears to be gold? Many parts of MB engines have a gold cadium finish applied to them. I believe this was a form of protection. There is still evidence of this on my '83 TD. For my diesels, it is all over the fuel lines going to each injector.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section