Oil vesocity for 6.7 powerstroke
Looking at the specs for the 6.7, it says 10w30 for normal use. Also see that 5w40 synthetic can be used in severe duty apps. Has anyone switched over to 5w40 for normal use? Does it hurt to do so? I ...
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I may have a different "6.7", however your owner's manual specifies that you can use 5W-40. I wouldn't worry about using 5W-40 year round. I believe the lighter weight oil viscosity that Ford specifies is more or less to help with fuel economy (talking about the 10W-30 here). This is a trend that all engine makers are moving towards for improved fuel economy. Even Cummins specifies that you can use 10W-30 in moderate temperatures for some of their engines (I recall ISB and ISL being on that list).
Personally, I like the idea of more protection from a thicker viscosity. I use Shell Rotella 5W-40. Then I don't have to think about ever changing oil just for that 1 harsh use I may have.
Personally, I like the idea of more protection from a thicker viscosity. I use Shell Rotella 5W-40. Then I don't have to think about ever changing oil just for that 1 harsh use I may have.
