I have used the M Benz touch up paint. It matches PERFECTLY! There is even a different paint for the bumpers, as they are plastic and flex. Cost about $39.00 at the dealer, for the 2 aerosol cans, (clear coat and paint), and he had to order it. I felt kinda ripped off until I sprayed it, and it was exactly right. Like anything else, spend the bucks to get the right thing. The results are worth it.

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1989 560SEL
1971 Cutlass convt. (sold)
1978 Olds Toronado (sold)
the rest are boring