Hi All - I need your help! Tomorrow I am changing the plugs, engine oil & filter, air filter, etc on a family friends 2010 Corolla tomorrow (as a Christmas gift), and I also wanted to drain and fill her auto trans (yes I know I will not get all the fluid with a drain and fill). Car has 150k on it and fluid has never been changed. Do I really HAVE to use Toyota AFT WS, or is there an aftermarket ATF (available at most autoparts stores) that will work? The local dealer is now closed, so looking for aftermarket alternatives. THANKS FOR ANY INFO YOU CAN PROVIDE!!!!