For what it is worth, and at the risk of sounding like I have some knowledge, I was always under the impression there is a distinct difference between the Auto lights and the Wipers - the latter not actually being Auto but using the rain sensor.
Auto lights will come on when it gets dark, so you don't have to turn the switch. Simple.
However, the first stage of the wiper is not so much an Auto mode as one which either uses the top switch to change the frequency OR the top switch to change the sensitivity of the rain sensing wiper mode. So, to my mind this wiper arm is ALWAYS off unless it starts to rain.
Then if it does, I put it to the first position and adjust the rain sensor sensitivity so it only sweeps when there is x amount of water on the screen. Thus if it changes intensity, the wipers keep up. If I had a manual (non-rain sensor car) then it would sweep with the same frequency every time regardless of the amount of rain.
Thus the rain sensor was not intended to be an automatic position, but one that changed the frequency of the wiper sweeps depending on the amount of rain. Thus if it was not raining, the wiper arm should be turned off.
Thus in my book it would always be better to have the wipers off until needed to avoid any issues, and not consider them an 'Auto' position...
2010 R36 (MY10.5), Biscay Blue, RNS510, MDI, Electric tailgate, sunroof, Superchips remap - SOLD
2016 Octavia VRS wagon, moon white, Tech Pack, 18" black pack, electric boot, panoramic sunroof, Bluefin
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