Rotella T6 5w40 or 15w40 in 6.0 - Ford Powerstroke Diesel Forum
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post #1 of 27 Old 09-23-2019, 07:51 AM Thread Starter
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Rotella T6 5w40 or 15w40 in 6.0

I purchased my 6.0 three years ago. On my first oil change, I switched to Rotella T6 5w40. Somewhere I read a Ford Bulletin saying that when switching to a synthetic, 5w40 was an approved oil for use in the 6.0. I've put over 35,000 miles on it since the oil type change.

Two oil changes ago I had an oil analysis done that said the engine was in great shape. A few months ago, I had a Ford Master Mechanic Bulletproof it. When he had the heads off to stud, he could still see the cross-hatching in the cylinder bores, indicating very minimal wear.

Now that Rotella is also available in 15w40, should I switch to it next oil change, or stay with 5w40?
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post #2 of 27 Old 09-23-2019, 08:17 AM
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Personally both are great oils. If you see cold (not relative cold) but like below under 30 degrees for a few months of the year stick with the 5w-40. The truck will have smoother cold weather operation. I only switched to the newer t6 15w-40 because my old 7.3l was burning the 5w-40 more than I liked. Im back to normal with the newer weight being just a bit thicker. (not sure how much but its reduced my oil consumption back to normal etc).
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post #3 of 27 Old 09-23-2019, 08:39 AM
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I live in Arizona i have always run the 5-40 mine does not lose any oil between changes and startups are always easy
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post #4 of 27 Old 09-23-2019, 11:10 AM Thread Starter
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Originally Posted by JustinOOO9 View Post
Personally both are great oils. If you see cold (not relative cold) but like below under 30 degrees for a few months of the year stick with the 5w-40. The truck will have smoother cold weather operation. I only switched to the newer t6 15w-40 because my old 7.3l was burning the 5w-40 more than I liked. Im back to normal with the newer weight being just a bit thicker. (not sure how much but its reduced my oil consumption back to normal etc).
Mine doesn't burn any oil, never have to add oil between changes with the 5w-40. Just turned 150,000 miles.
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post #5 of 27 Old 09-23-2019, 11:25 AM
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Mine doesn't burn any oil, never have to add oil between changes with the 5w-40. Just turned 150,000 miles.
Sounds like you know what oil to keep using.
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post #6 of 27 Old 09-23-2019, 01:25 PM
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I've run the T6 5W40 since it came out, and I love it. Great oil. Really quieted down my motor.

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post #7 of 27 Old 09-23-2019, 01:58 PM
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I notice I see T6 5W40 and T6 15W40 available locally. My guess is the T6 5W40 is being phased out. I see the 5W40 less and the 15W40 more. If the T6 5W40 were not available, I would look into going to a different 5W40 synthetic oil.
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post #8 of 27 Old 09-23-2019, 02:15 PM
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Originally Posted by ChrisSki View Post
I notice I see T6 5W40 and T6 15W40 available locally. My guess is the T6 5W40 is being phased out. I see the 5W40 less and the 15W40 more. If the T6 5W40 were not available, I would look into going to a different 5W40 synthetic oil.
I've actually seen it the other way around. As far as the 5W40 goes, it was introduced to provide better fuel mileage.

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post #9 of 27 Old 09-23-2019, 04:36 PM
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Well looking at the Rotella site, they now have 5w40 AND 15w40 full synthetic oil. Interesting, I didn't notice that before.



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post #10 of 27 Old 09-23-2019, 05:16 PM
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When they first reformulated the T6 they only released the 15W40. Then, they slowly started rolling out the 5W40.

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