I recently checked into this myself and found that hardly any after market parts houses carry the gasket or filter. I did find the filter at a Napa dealer. This was not so strange since I can only find the termostat at Napa as well.
Only until I got to the dealer and found that they did not even carry the gasket or filter did I ask why? This was when I found out it was a drain and fill system. Yeah I know, I am still learning alot about this puppy! The service manager came out and explained to me how to change the filter. Then asked if I really wanted to do it. He told me that they ask their customers to come in every 30,000 miles to drain the small amount in the case and carry on.
Phillip
Smithville, MS
