Probably not. Even though some dealerships sell parts for certain services at a discount, they would have to sell the internal filter at well below cost to sell it that cheap. It was probably just a fancy way to charge you $18 for a few quarts of tranny fluid. When we do tranny flushes at the dealership, we end up putting in four quarts (what was in the pan and filter) of brand new fluid as well. The only good way to do a tranny flush IMHO is to drop the pan, replace the filter, and put in the new four quarts. It's not because that's the way that ends up costing the customer more, it's done that way because it's the way that helps ensure the longevity of a very
expensive auto tranny
DanZ, this has everything to do with automatic transmissions
. Every Subaru since about 1974 with an auto tranny has had an internal filter for the ATF, and starting around 1999 they started using an additional external filter as well.