I knwo there is a lot of back and fourth on what weight everyone uses but I was in the shop today and playing around on Alldata and found a TSB stating that the 99-02 should switch from 5w-30 to 5w-20 which would increase fuel economy. Has anyone read this or tried it? Actually proof? Big deal? I know the 01-02 are already running the 5w-20, but if I can save a few MPGs I would like to.