Mixing those two types of coolant is pretty much NOT recommended by any of the coolant or radiator mobs out there, altho it's not really the absolute worst thing you can do in the way of mixing coolants & some products have similar enough additive packages that you can get away with it - but do you know if that's the case with the mix that's in your Spyder now!?!
Sooo, I still reckon I'd be asking for a flush & refill, even if you hafta pay for it, because you did ask them to check the fluid levels, didn't you!!
Check this lot out for some more info on the subject: http://mgaguru.com/mgtech/cooling/cool_121.htm
http://www.dslreports.com/forum/r285...opylene-Glycol
https://www.reddit.com/r/askscience/...pes_for_a_car/
There's heaps more where that came from!
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