Yeah it's the snow and the stainless. Not exactly sure how it works but it's only ever done it on one car that I've owned so it drove me nuts trying to track down what was leaking. I was online one day and a guy was complaining about the same problems and posted pictures. It was the exact same thing and another member posted a link to a site showing that it was a reaction to stainless and moisture.
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I drove the car I had for 2 years and never had to top up any fluids. If it helps the only fluid in your car even close is antifreeze, ac, and you don't have power steering fluid so it's not that. If your coolant stays up and your ac pipes aren't stained with refrigerant than it has to be what happened to me.
2009 Ford Escape Limited - 3.0L, 6 speed auto, 4x4, 25/33 city/hwy imp mpg.
2017 F150 XLT-XTR - 5.0L, 4x4, 3.55's, E-locker, xtr chrome package, fx4 off-road package.
20/25 imp mpg