I always wondered about 300E's as well. My friend's 300E had a lot of whine when it would accelerate. It sounded like a supercharger at times. I dunno if it was just gear whine, or just his car or if all 300Es are like that or what. But those 300E's are so quick compared to the diesels!

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1985 CA 300D Turbo , 213K mi