Does all diesel engine need Adblue. ??
Mercedes adblue is cheap enough, at £11.69 inc vat for 10L.
Your local dealer ought to have it in stock.
Bit the bullet and went to dealer - £15 for 10L over here.
Was tempted to get it from a pump at the service-station (only 26p per liter), but chickened out.
So does pee. What harm can it do ? Saves the need for loo stops, if you fit a tube into the cabin.I would only use the MB fluid too, it has a very specific ratio of water to urea.
I read that it is very corrosive and any spillages in the wheel well should not be left, so probably best to stick to the transfer pipe.