I had a good experience with Dr. Colorchip on my daughter's Saab. Never tried it on a BMW, though I would consider it on the future.
The chips on the Saab were many, but smaller. Don't know if Langka would work beter on the larger ones.
I think that a lot of the color-match depends on how faded/oxidized the original paint has become. The Saab was pretty decent in that regard, so it was a good match.
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