if it isnt washer fluid then why bother messing with it if its under the bonnet and under warentee? if it blows up after 12 months then why try to explain to the dealership why the oil plug has been out?
As much as i think about that I never touch anything under the bonnet or bmw will find you have had the oil plug out and probably say its voided the warentee due to you putting the wrong oil in or something...
just my opinion on it....
