Here is a good link to something somebody else tried that I'm currently looking into: Faded paint touch ups

I'm just not sure how well oil base enamel will hold up.

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'84 190d 2.2 - Silver
Converted to 5-Speed
'84 190d 2.2 - Blue
Factory 5-Speed

'76 300D (W115)
Sold, found again in less auspicious circumstances