Well, actually they don't require distilled water (unless they changed it in the past few years, as this BMW technical document is from 2007). I highlighted the water requirements, as the antifreeze requirements in the full document (below) aren't really part of this question.
Quote:
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.....However, it is not only necessary to comply with the mixture ratio specified; the minimum requirements for the quality of the water must also be adhered to:
• Appearance: colourless, clear
• Sediment, without suspended matter
• pH value: 6.5-8.0
• Total hardness, max.: 20° dH (German hardness grade) or in new measuring unit:
• Total hardness, max.: 3.6 mmol Ca 2+/ ltr.
• Chloride content: max. 100 mg/ltr.
• Sulphate content: max. 100 mg/ltr.
Potable tap water usually fulfils these requirements. Local water utilities can provide information about the quality of the water they supply. If necessary, the water must be treated (e.g. softened) or distilled water must be used.
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My city publishes water quality reports on the web. Not sure about the OP.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
Last edited by JCL; 01-30-2011 at 04:35 PM.
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