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      09-30-2011, 08:24 AM   #20
ShadeD1
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Drives: 2011 X5 xDrive 35i
Join Date: Feb 2010
Location: Houston, TX

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Wow, that was very helpful. Thanks!

Quote:
Originally Posted by motorking View Post
Good morning,
I am the technical manager at Prestone coolants. Using str8 water is really bad for your cooling system! Antifreeze/Coolant has more purpose than just freeze protection. The additives in AF prevent corrosion in the cooling sustem. Water is very conductive and running str8 water in your system can turn it into a giant battery and cause what is called electrolysis. Your cooling system will corrode from the inside out. You also need lubrication for your water pump seals. You can use Prestone extended life coolant in your BMW. Use a minimum of 35% coolant concentrate and distilled or deionized water along with the water wetter. Carefully clean the radiator external fins using cleaners marketed for cleaning a/c condensors. Removing dirt build up on the radiator fins can reduce cooling system temps considerably.
Jay Buckley
Prestone Coolants
jay.buckley@framgrp.com
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