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Had a 06 Silverado with a 5. 3l leeching ...
on May 3, 2015
Had a 06 Silverado with a 5.3l leeching coolant into the crankcase mixing with the oil. The cause was perosity in the material the heads were casted from(aluminum). The fix is to replace the heads, but this product stopped the coolant from leeching into the crank case...end of story.