I have never owned a car without a transmission dipstick for adding /checking fluid. Does anyone have experience with this transmission? It is on a 2006 Chevy Cobalt, automatic transmission is "lifetime filled". Well I normally drop the pan on my cars at 30,000mi, and refill with Amsoil ATF with a new filter. Is this overkill for these cars, and can anyone do it besides the dealer? Thanks in advance for any info!