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Originally Posted by Mark_T
Excellent point - I don't. Another good reason for changing it.
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I asked because I also didn't know what the coolant was in the car. So I wanted to make sure I didn't get a gelling problem when I put in the new Porsche coolant after doing the water pump, thermostat and oil cooler. So I had to flush the system. Royal PITA without a lift and/or special flushing plumbing. Fortunately I have the vacuum fill tool, so that helped a bit. But getting the car on and off of jackstands half a dozen times was no fun...