i have a ford f150 4.6 i know that ford recomends 5w20 oil, but i have been using 5w30 castrol high mileage i like it but since i have no oil leaks i wanted something different and better .so yesterday i went and bought castrol syntec blend 10w30!!!its a little more expensive but not as bad as a full syntetic.well my question is im i going to messup my engine by putting 10w30 in the 4.6?some how the engine feels smother and stronger with 10w30.also i think the part synthetic in the oil its better than plain dino.i wonder how many f150(1997 and up)people here are using 10w30?or im i the only one? by the way i live in n.c. where the winter its not that bad.
P.S. i wish i could do a poll on f150 owners on what grade oil they are using and brand hopefully some one can help set that up since im kind of new here on this site tks