There's more to "W" than just 2nd gear start. It does 4 things: Second gear start, earlier shift points, higher reverse gear ratio, and prevents roll-back on steep hills("hill-hold"). You can use either "W" or "S" at any time or all the time. My main use for "W" is the hill-hold feature when driving in SF. It works great
Dan

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2012 E350 Bluetech