 Our 2006 Toyota Avalon with 92k miles was diagnosed with a timing cover oil leak at my local Toyota dealership. Cost to repair was $1950. After discussing this the service manager and searching online, I find that this problem is very common in the 3rd generation Avalons.   We’re the original owner.  The car has been garage kept, not driven is any harsh conditions, and never in an accident.  The car has had service at our local dealership  every 5K miles. This is our first Toyota and we bought a Toyota car because of its long history of dependability. We never expected  such a costly repair cost like this, especially because of a defective sealant on the timing cover. Toyota has issued service bulletins on this issues. So they recognize that it is a problem,  I contacted Toyota customer service to complain and got no satisfaction.  This problem should have been pointed out to me while the drive train was still under warranty.