wrench light after oil change

[austin229]

I just swapped to 5w-40 from using 15-40 and this morning my wrench light came on. The oil level is good but I'm thinking the oil is to thin.any one else had this happen?

[BigIslandBoy]

What codes came up? Did you take to the dealer?

[austin229]

I didnt have a cel or code on the h&s. The wrench light went off as soon as I cut the truck off and restarted it. Must have had something to do with the eot being cool and on a higher tune. It's running fine and hasn't done it again. I'm probably going to go back to 15-40 soon anyway though

[BlueF350]

The 5w40 is fine for the 6.4. Actually, mine ran better (fuel mileage) on the Rotella T6 5w40 than 15w40. I didnt like the 15w40 at start up. Just too thick when the motor's cold.