Just how important is oil viscosity (the number after the W)

Discussion in '1997 - 2003 Ford F150 Truck Forum' started by geezer08, Feb 19, 2016.

< Previous Thread | Next Thread >
Page 2 of 2

  1. whomrig TOTM Winner Founding Member Southwest Chapter

    So maybe the 5w-20 would work in place of 5w-30?
     
    whomrig, Dec 15, 2020
    #16

  2. NRA4ever Founding Member

    I've run 4 mod motors to 200.000 miles using Mobil 1 full synthetic 5w20. None of them had oil related failure. I ran the crap out of my 97 F150 with a 5.4. I raced it often.
     
    NRA4ever, Dec 21, 2020
    #17
Page 2 of 2
< Previous Thread | Next Thread >
Loading...