So the manual gives a choice of full synthetic,synthetic blend,premum synthetic blend,and regular oil. Since I will be on the heavy duty maintainance shedual with a change evey 5000 miles I was thinking either the regular oil or the synth blend. I was told full synth will increase gas milage. True? Any advantage of premium synth blend over reg synth blend? Any issues using Mobil 1 synth?
In the past I never used synth, always on schedual with regular oil changes and had good results.