Prestone teal colored euro coolant has never failed me.
I use the Prestone 50/50 Prediluted coolant which states “guaranteed for all vehicles American/Asian/European” on the label. It is yellow/green. Zero issues because it matches the specs in the manual.
I use Prestone teal European car formula. No problems yet
OE BMW coolant should be your first choice, and if it can’t be, second would be another reputable coolant maker that offers a European vehicle variant. For example, Prestone makes a blue in color variant formulated for use in euro cars. I’ve used both, never had an issue with either.
Replace the orange stuff with new Prestone orange stuff.
I went with Valvoline Xerex G40. BASF G40 is the equivalent of G12++. Valvoline/ZEREX G40 Euro Pink coolant meets this newest worldwide standard BASF G40 and German standard VW G12++ .
For coolant - cheap Prestone (concentrate) got my old Speed3 to 60 000km no problem. I used 25% glycol and 75% distilled water and a couple caps of redline water wetter. No more overheating, even idling in +35°C.
Brands I recommend are of course Toyota OEM Super Long Life coolant and surprisingly Walmart Asian Red Super Long Life coolant (actually comes out pink ) has never failed me and I offer that as an option to my customers. Then there is the Valvoline zerex Asian I don\u2019t highly recommend this coolant but it does work just not that well from my experience.
I have two gallons of this I've used in my 2009 B6 Passat that is leaking coolant. I don't drive it much, just once in a while. I just don't have the funds to fix the leak, which is likely the water pump. This coolant works just fine for me!
In a pinch I added Prestone Universal green to my VW coolant, next day the expansion tank had a nasty looking brown mixture in it that freaked me out, my desire to put inexpensive universal fluid to top off my B6 ended up costing me over $150 for VW to drain, flush with cleaner and refill with G12+.
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