Hello everyone, i need some help, I attempted to change the ATF on my 08 yesterday. Being the first time, i went to the dealership and bought the Subaru ATF (which happened to be ATF-PSF) and the guy told me that i would need 4 quarts since thats what they use when they do it at the shop. Once it was cool enough, i let it drain for about 20 min, put the new filter back and re-filled it. Took it for a test drive and noticed a strange noise at low speed from 1st to 2nd gear. Not quite "grinding" but similar to the washer machine in spin cycle displacing water (or fluid in this case). Now, it only happens at low speed from a stop and not at higher speeds. Was 4 quarts not enough? Now of course being Sunday the dealership is closed so, if i need to add more, is it safe to add a different type such as M1 ATF?