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Old 10-23-2010, 06:49 AM
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wrench light after oil change

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?
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Old 10-25-2010, 03:04 PM
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What codes came up? Did you take to the dealer?
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Old 10-25-2010, 03:18 PM
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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
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Old 10-27-2010, 10:12 AM
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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.
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