I think you are 100% right to be sure not to add the wrong coolant.
But based upon my experience with a leaky coolant tank on my Cooper S, my recommendation is that if you're only down at the minimum level, you might be able to avoid adding anything. The 'leak' on my MINI never seemed to get below the minimum level even for the 6 weeks before I got the tank replaced.
+ 2002 MINI Cooper S - Dark Silver / White roof, Sport, Premium, Lapis blue leather
+ 1965 Mini Traveller - Tartan Red / White roof, 1275, Cooper S discs, fully restored/renewed
BMW and MINI antifreeze are not the same. They even have different colors. BMW antifreeze is almost orange in color, while MINI's antifreeze is blue/green. Now, I've heard that the MCS comes with the orange type antifreeze. If that's the case, then maybe the one used for the MCS is the same as that for BMW.
When I called my service dealer about topping up on the reservoir "minimum" level, he said to get the MINI coolant and not the BMW coolant. I can understand that you shouldn't mix the two if they have slightly different formulations. Has anyone with a MC (not MCS) used BMW coolant to top up his/her reservoir?
When I decided to buy the coolant---I ask the MINI Service Advisor if I can get other "brand" of coolant. He told it's much better to get the BMW coolant which he believes the same thing being used on the MINI.
I followed his advise & it seems no problem so far after 2 months since I top-it.
I had a quick read of this site and didn't see any discussion about this being an ANTIFREEZE - everything is about its value as a coolant but at what temp will it freeze? It might be there and i just missed it
I know that 100% Glycol is not as good an antifreeze as 50/50 water/glycol so i would want to have that answered bfore making any choices.
Typically one would want to change antifreeze every 2 years and i would probably stick to that personally even if I was using their product.
I have deep personal suspision of all long life products which claim to keep working for hundreds of thousands of miles. they may still be viscous or whatever but surely they are pretty dirty by then and I am just as worried about solid particulates (sp?) in any fluid as the fluid itself - just an old guy's opinion
Southern Ontario MINI Club
BMW Club of Canada - Trillium Chapter
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