If you're never going to visit a dealer then it's no problem. I'd take over-priced screenwash over having to clean out the washer bottle again.Mr Tidy wrote: ↑Mon Jan 14, 2019 11:15 pmBMW stuff. I've only ever used cheapy Prestone screen-wash from Tesco since I cleaned it all out. Did the same with my E46 and that worked for 3 years until I sold it.R.E92 wrote: ↑Mon Jan 14, 2019 5:40 pmYou got it. The problem comes from mixing different types of screenwash.
BMW use a different chemical to most other screenwash. The best thing to do is buy a 5L bottle of the BMW stuff from the dealer and top it up yourself. If you go and buy some supermarket screenwash and then it goes into BMW for a service and they top it off with some BMW brand stuff you end up with clogged washers and a tank full of gunk.
Seeing as my Z4 won't ever be going to a BMW dealer it won't get topped up with their "snake-potion"!
Although I did buy some of the BMW branded stuff for my E91 as it has full BMW service history up to 132K miles, and the reservoir is hidden in a front wheel-arch!
To be fair, the BMW stuff works really well at getting rid of grime so it's not a complete ripoff. I last paid £18 for 5L and It's pretty concentrated stuff (Works down to -63C) so I use 1 part screenwash to 4 parts water. I tend to get 3 years out of a 5L tub.
For anyone reading this who's interested in the BMW stuff, it's available on the BMW store: https://shop.bmw.co.uk/bmw-uk/en_GB/p/g ... 3005000ml/
Or for the more discerning person with a little more cash than sense there's the organic ginger infused option (that's got to be an april fools joke they forgot to remove!!):
https://shop.bmw.co.uk/bmw-uk/en_GB/p/- ... t/2405483/