Steve, I just replied to this thread in the detailing forum. If I recall right, the parts guy at my local dealer, Knopf Automotive in Allentown PA, was not sure about what Winterwash was either.
I think the Summerwash may contain enough surfactants to work alone with a water mix, but I could be wrong. Since I live in an area that has subfreezing temperatures several months of the year, freezing is an issue for me. Actually I just let my independent garage fill my reservoir with Wurth brand fluid. Smells nice too
Has anyone recently used the concentrated stuff that GM used to recommend? I guess my only real concern / question would be how much alcohol or whatever antifreeze agent is in a winter concentrate, vs the cheapie generic washer fluid.
Perhaps a chemistry gury could chime in here? Somehow my hunch is that it would take roughly a pint of alcohol to reduce the freezing temp of a gallon of water to -20F, but I've been wrong before. Thoughts?
Lehigh Valley PA USA
73 Olds 88, 72 MB 280SE, 78 Datsun 280Z, 71 T-Bird, 72 Olds 88, 83 Nissan Sentra, 85 Sentra, 73 230.6, 91 Integra, 83 300SD, 91 Volvo 940GLE wagon, 84 300SD, 95 Subaru Legacy L wagon, 02 Mountaineer, 91 300TE, 08 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon all gone... currently
2007 Honda Odyssey Touring, 2011 Honda Odyssey Touring