5w-40 in hot weather

[powerstrokedieself250]

I run cheap 15-40w and have been. trying to ease up on injector stiction.
i do search before i post and have found plenty saying use 5-40 but im in florida. havent seen anyone say anything about temps. good in 90 degree weather? or should i say good all year round?

[roche837]

run it and don't look back

[srjd]

As long as the end number is 40 you are fine. In my truck I run 0-40 year round and I know some guys that ran 0-40 all year in there 6.0 you will be fine and your 6.0 will like it

[PGreenSVT]

It is still a 40 weight when warm. It is good for year round use. Cheap 15w40 is why you have stiction issues. Put 2 bottles of Rev-X in with a fresh load of 5w40 synthetic and see if that doesn't fix you up.

[fordpwrstroke7]

5w40 Rotella Full Synthetic year round. I'm in Texas.

[Strokinforlife]

I have ran rotella 15w40 in my truck since I bought it and I now have stiction issues with mine too I have the rev-x on the way and I have the new 5w40 synthetic waiting on it too. The ford book recomends 15w40 but it has caused trouble with mine.

[bismic]

Ford recommends 5W40 and has for a LONG time.

[WarChild]

Im in FL. I run only T6 and rev x in every oil change.

[Idahoser]

stiction seems to be caused by using natural oil. Switching to synthetic will stop making it worse, but you need a shot of RevX to get it clean the first time. After that you are throwing away money using more RevX.

[U235a4]

Originally Posted by bismic

Ford recommends 5W40 and has for a LONG time.

I haven't seen that on a oil rec chart yet... do you have one handy, The last one I seen was with 5w40 is the same temp range as 5w30.