Mixing Coolants

[Astroboy]

Originally Posted by MrTranxD

Everyone always says to use only the blue OEM Subaru coolant, but noone ever explained why. Well in the auto tech class I'm taking, I was informed that the blue coolant will turn into a jelloy type substance when mixed with other coolants. I can confirm that this is true because when I went to look at my car, which I topped off with some random other fluid, there was a bunch of jelly type thing at the spout of the radiator cap. Just explaining why everyone is so worried about the coolant thing! If you did mix coolants, I think its best to go and do a flush and refill.

I topped my coolant a few years back with peak's 50/50 green mix in the over flow reservoir and never really encountered anything jello. 3k miles ago when installing my turbo kit, we had to re-route some of the coolant lines. When we did, the coolant seeping out was still blue, and liquid.

I only topped it with about a full cup. Should I switch back immediately or is it ok to run no more than 30k like the manual recommends. My coolant temp stays between the 90-100c. Oil temp, 90-110c, depending on how hard I drive it