99 F150 4.2
With 2500 miles on the 10w30, the motor now idles and runs smoother and quieter than when the oil was fresh.
But when I start the truck the motor cranks slower. I think it takes the same number of revolutions to fire, but just about 1 second longer.
Should I stay with this oil, or switch to 5w20?
With 2500 miles on the 10w30, the motor now idles and runs smoother and quieter than when the oil was fresh.
But when I start the truck the motor cranks slower. I think it takes the same number of revolutions to fire, but just about 1 second longer.
Should I stay with this oil, or switch to 5w20?