Engine temps with new oil - Ford Powerstroke Diesel Forum
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Old 12-05-2007, 03:12 PM

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Engine temps with new oil

Last weekend, I changed my oil, and am now running Rotella Synthetic 5w-40.

First off, it seems to start much easier in the cold (no stuttering at all), so I am very happy with that.

It seems to me though, that it runs a bit warmer than it did with the 15w-50 that I had in the truck before. I don't have an aftermarket coolant temp gauge, just the stock gauge, so I can't be exact, but It seems to sit higher on the gauge than it did before. On the stock gauge, it sits a little less than 1/2 way up. Before the new oil, it seemed to sit about 3/8 of the way up. Coming home from work tonight, i had the heat on full blast, and it seemed to sit at about 3/8 mark. I turned the heat off and drove the rest of the way home (about 1 1/2 miles), and it raised back up to were it normally sits, just shy of 1/2.

Has anyone experienced something similar? Is there a lgoical explanation that I am just not seeing?

It seems to run just fine, and is quieter now when running warm, and as mentioned before, it starts much easier in the cold.
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Old 12-05-2007, 03:23 PM
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I switched to 5w-40 last winter and mine seems to sit in about the same spot on the gauge Keep an eye on it I guess.
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