hello. im thinking about switching oils in my 2001 grand prix and im stuck between valvoline maxlife, and valvoline durablend. my car has a 3.8 liter v6 with 90000 miles on it. i want a synthetic blend, and ive always liked valvoline.... i noticed the durablend is more expensive, but from the labels, the maxlife says it has more things to help your engine. i would appreciate any and all input on this, thanks in advance....