phlat65 wrote:there are many coolant formulas thee days, just stay away from the high silicate formulas. something interesting I just read, conventional coolants use silicate to lay down a corrosion protection layer, that depletes pretty quickly from the coolant, but the new mixes like dex-cool and such suspend the corrosion addatives in the coolant so they last a long time. that is why they consider them lifetime.
having worked on VW's for a lomg time, the blue coolant is the only formula that will keep a water cooled vanagon from corroding the heads at the gasket area and leaking. and it works well with aluminum engine parts.
that's interesting. i don't know if the VW dealers here would have it.
anyway, yes, check the description re the formula - if they don't give any information, go to something else. i've been using MOTUL stuff, including the premixed coolant (which is not more expensive when you look at what they charge for bottles of distilled water here, and i don't have to measure it, i know theirs is right, proper deionised water. ... then there's Silkolene - that MZ recommend, and Motorex.