Motorcraft 10W30, 5W40, Rotella or Mobil 1 for 6.7

FishOnOne wrote:
As for the Mobil One vs the Rotella T6 I would go with the T6 since it's on Fords approved oil list.

As for my truck I run Motorcraft 10W30 year round and purchase it and the oil filter from Wal Mart.

Ditto! Much better price at Wally's.

I'd do like I always do on all my vehicles. I use exactly what the manual calls for. I do not deviate. Why in the world does everybody think they are smarter than the engineers who designed the engine?
I'm a fan of Rotella. I've been using it form many years and have had no engine problems in any of my trucks. My current Duramax is at over 260,000 miles on Rotella and the engine runs great.

I think it very unlikely a Ford dealer is offering to install the wrong oil in a PowerStroke. More likely something has been misunderstood or lost in translation.

The factory fill is the 10-30 semi synthetic. That’s what my dealer puts in unless requested for the 5-40 full synthetic.

Doesn’t anybody read the book?

Regarding the recommended oil, your ‘15 model is identical to my ‘16, and per the guidelines in the Diesel engine supplement you should be following the “Severe Service” oil recommendations. Hauling a TC or towing a trailer can have your GVW maxed out, and the terrain you’re traveling, ambient temps, and bio-diesel usage all have an effect on oil life, and the type of oil you should be using. The recommended oil for severe service is 5W-40 CJ-4, which is only available as full synthetic. It even says this on the oil filler cap.





When I was taking my truck to the dealership to take advantage of the “free” oil changes they offered when I bought my truck, they always wanted to put 10W-30 non-synthetic oil in it. After the second time of arguing with them, and making them drain out the non-synthetic, I went back to changing my own oil. Free isn’t free if they’re doing it wrong.

Also, this was the first vehicle I’ve owned that had an oil-life minder to tell you when to change the oil, and I was curious as to how accurate it was. My concern was that it was telling me to change the oil too late, rather than too soon, so I sent a sample in the last time I changed the oil. I’m not interested in getting every last mile out of the oil.

On the last oil change, my oil minder had gone from “change oil soon” to “change oil now”, and I had driven a couple hundred miles beyond that. The report came back saying it was still useable, and the only concern was that there were some oil additive components present that should not have been in the “synthetic” oil I had identified on the submission form. Those components were apparently from the ~1 qt. of non-synthetic oil that was left in the filter from the last “free” oil change.

So like I said, I change my own oil now, and I trust the oil life minder.

:):)

Ductape wrote:
I think it very unlikely a Ford dealer is offering to install the wrong oil in a PowerStroke. More likely something has been misunderstood or lost in translation.

I don't. I would bet it's what they have in bulk and make the most profit on. This is just one of the reasons why I do my own servicing. OP, I would go with what the manual says, and stick with synthetic; it will cost a few bucks more but well worth it especially if you plan on keeping the truck for a long time. I also only use OEM filters on all of my vehicles.

5-40 T6 on my 2015 just short of 100,000.

10W-30 CJ-4 oil is fine in the 6.7 Powerstroke for “Normal Service”.

Towing and hauling aren’t normal service though!

:):)

2011 F350 6.7. 10W 30 Motorcraft is listed oil for 20*-100*, 5W 40 for towing 1000 miles or severe duty-also Motorcraft. I went with the 5W 40 for this first change.
Next up is coolant flush, differential fluid and front wheel bearing repack, then fuel filters, air filter (maybe), trans filter and a possible serpentine kit with tensioner and idler changed along with new belt.

The dealer is using what Ford specs for normal service. If you don't use the truck in normal service, it is up to you to tell the dealer that you need severe or extreme service oil. How is the dealer supposed to know unless you tell them. And of course, expect to pay extra for the upgraded oil.