Hello everyone. I have a 2012 Nissan Versa with about 16500 miles on it. I have been doing the OEM oil change at 3750 according to the manual. That car currently has Smitty's synthetic blend 5w-30 in it and a Puralator Pure One oil filter. I just ordered Amsoil OE 5w-30 and an Amsoil K15 oil filter. For those of you out there who use Amsoil, what do you think of it? I also bought a bottle of PI for the gas tank.