Have a 1999 Nissan Altima with a 2.4 motor. Has 327,??? miles and leaks oil. Was told that front oil seal (on pass side of motor) is leaking. Have spots of oil going down the pass side of car. I add different amounts when I add oil. I use 10w30 or 10w40 Supertech blend and some MMO. Planning to get the seal fixed in a few months after some other things have to do. Also have gas smell in oil and going to get the PVC replaced soon hopefully. Found out about Valvoline Restore and Protect so should I use it or something else? Thanks