Dexcool is not suitable for systems that have an "air pocket" expansion tank like our cars - it will cause some trouble (very little because the tank is plastic)

On other cars with radiator caps on radiators and separate expansion tank (system chock full of coolant) this works perfect. This failure usually shows up with low coolant level in the radiator and also due to the "loose valve" radiator cap. I discussed it with a lab tech where I work and there conclusion was that it as it actually lifts rust that is formed by oxidation (only happens in air presence aka low coolant) - the mud is actually the lifted rust. The gelling is not rust - that is usually adulterated coolant (GM plastic gasket syndrome anyone?)

I have seen this coolant being used in Asian countries - infact if you just pour this into a previously rusted system and drive around the engine will become clean but the coolant will become mud - drain and be amazed at the newish looking engine after the initial flush. You might have sprung leaks anywhere there was corrosion.


IMO - BASF Glysantin G05 (zerex G05) is pretty good all round. I have also heard that using Shell LLC or Final Charge LLC is a step up for our diesels.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)