I used an older ford coolant premixed green in my Subaru Impreza sti by accident. It was only in for two days before I drained and flushed and used the Subaru blue.
I think it might have messed up the seal on a new water pump. A little coolent is leaking right above the thermostat.
What makes this problem better or worse?
Leaks more when tuning and system is under pressue
How long has your 2006 Subaru Impreza had this problem?
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It's hard to say what could happen after a couple days. Sometimes the system can begin to clog up if different coolants are mixed. In your case I would diagnose the leak and repair it. Flush the system with water and a cooling system flush product you can find at all auto parts stores. Flush with water a few times to be sure its all out and then refill with the proper coolant.
Alex
Unless the antifreeze was *extremely old* - it should not have caused any problems.
Extremely old = content ingredients - newer antifreeze brands are pretty much universal.
I don't think that caused any cooling system failures - especially in such a short time.
