I completely agree. Just make sure whatever you use is phosphate and silica free.

 

Hi guys i have a really stupid question for ya can i add weter wetter into the expansion tank and have it mix in on it's own,coolant needs a top up in any case and want to add this stuff or do i have to go to the hassle of siphoning off some from the engine and add directly into the system,what an idiot i am

 

Coolant tank is fine.

 

If the coolant is orange, drain it yesterday. It is the biggest scourge on the planet, it eats aluminum engine parts and will destroy your engine. GM has been using this crap under the trade name DexCool for years and their problems are endemic but they are too bull-headed to admit they screwed up.
Type in "DexCool" in Dogpile Search and see how many thousands of negative posts come up. Drain out the garbage, put in the green and change it every 2 yrs, your MINI will thank you profusely. My Cobalt , purchased brand new, had it too and I flushed it all the first chance I had.