I was going to get a case of Valvoline Maxlife because it is on sale for around $1.88 a quart, but then I called NAPA and they have their high mileage oil on sale for $1.47 this month. I have been told the NAPA is the exact same as Valvoline, but have some reservations. All I can confirm from the NAPA dealer is that it is bottled by Valvoline. (All other oil brands aside,) should I get the Valvoline or the NAPA?