One problem related to blown head gasket has been reported for the 2006 Toyota Highlander. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota Highlander based on all problems reported for the 2006 Highlander.
I was advised that my head gasket blew at 80,000 miles and when they went to fix it they found the threads were stripped and I need a new engine? at 80,000 miles, this is insane. I googled this problem and found many people are having the same problem. There is obviously a manufacturers defect with these bolts. No way the threads should be strippled and a head gasket blown at 81,000.