[E90F30er]

I thought you mix it in a bottle with water and add. The Halfords instructions say add to reservoir and then add water per the ratio required?

I don't understand the all seasons screenwash (pre-mixed). If it's suitable for winter then in summer you are using a much higher concentration than needed - could you add some water to what's left in the summer months to get more for your £?

What happens if you have an amount of summer concentration in the reservoir then in winter top if up with a winter concentration - both will mix making the total less than the winter concentration in winter months? Does it matter? Thanks!

[raj55]

Make two lots of solutions, one weak one for the summer and one strong one for the winter. Start pouring in the winter one, atleast a month before winter starts so that you do not get caught out with frozen windscreen fluid. I usually buy a concentrate and then dilute it according to the instruction on the label. Normally the pure concentrated one is good for under -30deg C. The label will tell you what dilution with water will give you one good for minus 15C or minus 10C etc. Even for the summer use, i do not go under minus 5C dilution.

[G82Dude]

Always mix it first [in a spare container] and add it to the reservoir. Car Plan/Duco stuff is usually 10% in summer and 25% (or more) in winter.

[Subzero2003]

I would advise only using BMW stuff which stop the common sludging issues.

[G82Dude]

Originally Posted by Subzero2003

I would advise only using BMW stuff which stop the common sludging issues.

Been using CarPlan for ~10 years (and Duco ~5 before it), and never had a problem. And £19 gets you a 25 litre drum of CarPlan off eBay, delivered!

[SteveC]

Personally I would also recommend the BMW washer fluid. a little goes a long way (5:1 dilution) and its very resistant to freezing when temperatures hit -5 or below.

2 winters ago there were cars stopped everywhere because their washer pipes were frozen. My daughter used ready mix and we had to take her car to Audi's hot water car wash to get the lines melted so we could flush and replace the washer fluid

In addition it causes no damage to paintwork and does not allow build up of sludge

[E90F30er]

Will have to research on BMW's screenwash - thought it would be just marketing hype - Carplan / bluecol / Holts / Prestone in a BMW labelled bottle? How much - from dealer only? I've never experienced sludge issue - had car for years.

[Jase 320d]

Tesco's garage

£1 into screenwash machine
(If your quick you can also check tyre air pressures)

Voila best bang for buck and i've never had it freeze

[G82Dude]

Originally Posted by E90F30er

Will have to research on BMW's screenwash - thought it would be just marketing hype - Carplan / bluecol / Holts / Prestone in a BMW labelled bottle? How much - from dealer only? I've never experienced sludge issue - had car for years.

Yup, it's a bit like the whole Castrol vs Comma vs Brit Oil debate. BMW don't make screen wash (or oil), they pop it in their bottles with a BMW logo and charge 4 times the price.

Car Plan or Duco is fine, although doesn't smell quite as nice as BMW's...

[DavS1]

I think you worry too much. jus' sayin!

[E92Dan]

I just bung in what ever I have with some water and I've never had a problem

[E90F30er]

Originally Posted by DavS1

I think you worry too much. jus' sayin!

Referring to me or others? I'd be more worried about quality of engine oil - screenwash isn't safety critical as along as it doesn't freeze isn't supermarket or those cheaper stores (Home Bargains) stuff fine?

E92Dan, you mix it first or bung in screenwash then water separately? For a 50% each (winter conc.) mix just add 1L screen wash then 1L water or mix together in 2L bottle and add? E90 reservoir about 6L in manual.

[DavS1]

Yea sorry I meant I think you're worrying to much about screenwash. Just pour it in, taking note of what the bottle sais and fill with water. simple!

[E92Dan]

I just pour the bottle in and add whatever water it says. It will easily mix itself. Never even thought about it before if I'm honest