Quote Originally Posted by steve_bunkle View Post
Wiper blades.

Remember when you buy wiper blade refills, driver's side takes the wider blade (8.5mm), passenger side a narrow refill (6.5mm). Why on earth they did this we will never know.

I found this out the hard way.
Only an issue if you're running stock wiper arms of course... I think it's recommended that the wiper arms get replaced every 5 years or something, so you should be on a new set by now... or buy Aerotwins or something similar instead