 We purchased this car new and kept it dealer maintained for 7 years.  I found it to be quite a reliable vehicle until recently.  At 118,000 miles it developed a coolant leak.  It was ultimately found to be due to stripped out threads in the engine block (i.e. the car needed a new engine ~ $7500.00).  After discovering that I was not the only one to experience this problem (check online Toyota forums), I notified Toyota.  The Rep stated, "Your engine may be defective, but we cannot help you because you are out of warranty."  Beware of the 4 cylinder engine in the 03 Highlander!  A dealer maintained vehicle is worthless, and Toyota has lost a customer.  And so it goes.