One problem related to engine grinding noise has been reported for the 2008 Toyota Highlander. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Highlander based on all problems reported for the 2008 Highlander.
When you start up car there is a engine grinding noise for a few seconds. This has been reported by many people on the internet, just google 2008 Toyota Highlander start up engine noise and you will get a better look at what it sounds like. This could lead to severe engine damage . It is a defect in the engine.