My problem with 'L' is that it causes extra drag on the front wheels, which leads to understeer and only gets worse as you lift off the 'gas'. Yes, there are all kind of electronics that might or might not mitigate this, but to my way of thinking once these kick in you've already lost it and turned your fate over to the silicon god.The manual states "You can use L (Low) on very steep hills, in deep snow, or in mud.", those seem like slippery conditions
I'm not so sure about the quote Joe supplies above, my memory says the manual told me not to use 'l' in slippery conditions, but I stand to be corrected (since I'm not sue where my manual is) I'm talking ice or slush as opposed to mud. Deep snow is another thing.