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If you do a complete flush, you could use green Prestone. HOWEVER, I would not for a number of reasons. G12 is long life and will outlast prestone, I forget the exact chemistry, but G12 will not eat the aluminum, and G12 will not cause buildup on the water coolant passages. It really is a better coolant. G12 does not look brown and nasty after high miles so I'm pretty sure it's been mixed.
http://www.myturbodiesel.com/1000q_how_to/a4/coolant_flush.htm Here are some tips - note the section on thoroughly flushing the system. I would also replace the reservoir tank. It's cheap and if you had mixed coolant it's probably crusted and stained inside. I've had lots of G12 shipped to me before with no restriction. mjmautohaus has a deal on G12 if you buy a lot.
http://www.myturbodiesel.com/1000q_how_to/a4/coolant_flush.htm Here are some tips - note the section on thoroughly flushing the system. I would also replace the reservoir tank. It's cheap and if you had mixed coolant it's probably crusted and stained inside. I've had lots of G12 shipped to me before with no restriction. mjmautohaus has a deal on G12 if you buy a lot.
