It was in a book.
I have the 23rd anniversary of the beetle book, and it said that after 71 VW started to change the valves in the heads to be more environmentally sound. So we can burn unleaded in 72 bugs and beyond.
I lived in Germany for four years and ran leaded in my 72 over there, just because everyone told me I had to. She lasted my entire stay, so I guess no harm done.
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