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.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member