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I asked an MB engineer about those vacuum locks. He looked at me like I was nuts to dare to question the engineering prowess of the mighty Mercedes-Benz. His explanation was that the vacuum door locks operate even if the battery was disconnected or the electrical system was disabled. This was safer in the event that you had to be rescued from a wreck.
I also asked about the lack of variable intermittent settings on the wiper. This was before the rain sensor was introduced. He again raised his brow at me, and replied "the five second interval is the correct one."
I wish I had his name and phone number so that I could ask about all the new cars with electrical door locks.
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