[lukerman]

Not sure if this is applicable but I drove several ford rangers when I was growing up and I ran it hard, and I always ran 20w 50 in it, and even in st louis winters, they survived. I always had lifter noise if I ran the 10w 30 or 40 and the 20w 50 fixed the problem. I feel the harder you run anything, thicker oil cannot hurt. for what its worth, thats my 2 cents. the same goes for my 71 mustang.