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Discussion Starter · #1 ·
I traded my 97 E420 on a 03 E500. The E500 has a more engine noise compared to my old 420, especially at acceleration- almost a pinging/rattling sound. I realize the 420 was a 4 valve and the 500 is a 3 valve set up. Any others out there with this experience? Hopefully, it is simply bad gasoline...
 
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