Reply To: coolant in a 12

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Hello Doug,

For what is is worth, I learned a long time ago from the collective knowledge of the Society that anti-freeze in our old engines likes to foam up and ends up pushing coolant out the overflow. Plain water is actually a better coolant and transfers heat more readily than ethylene glycol anti-freeze. However, plain water is also bad from a corrosion standpoint (as Bill pointed out above). About 5 years ago, I started using Pencool 2000 as an additive in my cooling system. It acts as a corrosion inhibitor and water pump lubricant. It is used in diesel truck engines and is available from shops that service semi trucks. There is no anti-freeze property to Pencool 2000, but during the driving months, I have been very happy with its performance in my Pierce.

Happy Motoring,

Chris