I've never read anything really great about any of the 5w50 oils on here. I've personally used 5w50 Mobil 1 and Castrol quite a while back (because they were a classic car formula with extra zddp) in my high mileage 1976 350 Olds and it didn't really seem happy with either one (more valve train noise and a bit sluggish). Most of the past 10 years I've used 0w40 or 5w40 hdeo or Euro oils. Lately I switched to Xw30 oils because I discovered it actually likes anything 30 weight.
I'd maybe consider Mobil 1 Euro formula 0w40 in your truck. That's what I'm using in my Caprice (my winter beater) and it looks to be a really good oil and goes on sale often.
I'd maybe consider Mobil 1 Euro formula 0w40 in your truck. That's what I'm using in my Caprice (my winter beater) and it looks to be a really good oil and goes on sale often.