Sheldon, it's true:
After break-in I upped mine to 10-30 and the MDS worked less and the fuel mileage went down. I went back to 5-20 and right away you could feel the MDS was more active and the mileage went back to normal.
Never would have believed it, but yup, 'dats whut happened.
I guess Fords' been using 5-20 for a number of years now, at least thats' my Oil Guy told me. So now, I'm kinda thinkin' I might try this light stuff in my 360 Mag............
It has 15-40 in it right now, wonder where that stuff came from, huh?
