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Old 05-20-2012, 04:50 PM
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5w-40 in hot weather

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?
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Old 05-20-2012, 05:21 PM
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run it and don't look back
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Old 05-20-2012, 05:30 PM
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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
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Old 05-20-2012, 05:33 PM
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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.
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Old 05-20-2012, 05:47 PM
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5w40 Rotella Full Synthetic year round. I'm in Texas.
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Old 05-20-2012, 05:48 PM
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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.
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Old 05-20-2012, 06:20 PM
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Ford recommends 5W40 and has for a LONG time.
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Old 05-20-2012, 08:07 PM
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Im in FL. I run only T6 and rev x in every oil change.
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Old 05-21-2012, 09:16 AM
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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.
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Old 05-21-2012, 09:49 AM
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Quote:
Originally Posted by bismic View Post
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.
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