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Discussion Starter · #1 ·
First experience with diesels and trying to figure out whether I should be on a severe duty schedule. My truck is driven 5000 miles per year. Probably 75% will be towing a trailer that weighs about 7000-8000 loaded. But none of it will be in 1000 mile trips that the owners manual talks about. Most will be 200-500 mile tows.

2012 F250 6.7L
 

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Many people on here used a synthetic oil whether severe duty or not. Use the oil you want that gives you peace of mind.
 

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I recommend you follow the severe duty schedule.
 

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Discussion Starter · #4 ·
Yea, trying to figure out which oil grade to use. It was fleet truck before I bought it. So, I'm guessing that it got standard factory fill (10/30) up to this point, even though it towed a lot. So, going to switch to 5/40 Rotella T6 based on these responses.
 

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use the oil you desire is the key. All the oils and ratings in the owner's manual are acceptable for the temp range listed. The duty rating is only a suggestion from Ford, not reason for voiding a warranty if not followed.
 

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Discussion Starter · #6 ·
use the oil you desire is the key. All the oils and ratings in the owner's manual are acceptable for the temp range listed. The duty rating is only a suggestion from Ford, not reason for voiding a warranty if not followed.
I'm out of factory warranty - have 120K on mine. So, longevity is what I'm interested in.
 

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Does your operating conditions include any of the other requirements for severe duty as shown below? If they do, I would run a synthetic or a synthetic blend. In the mainstream oils that I have used (Rotella T6 5W-40, Kendall Super-Dxa 15W-40, Delo 400 LE 5W-40, Delo 400 XLE 10W-30, Mobil Delvac 1 ESP 5W-40 and Motorcraft 10W-30) only the Rotella T6 and Kendall have the Ford specification (WSS-M2C171–E), but obviously all of them meet API CJ-4.

My ranking of those oils are (based upon performance, "noisiness", cost, and availability):

1 - Mobil Delvac 1 ESP 5W-40 (most expensive synthetic, but "best" overall--IMHO)
2 - Kendall Super-Dxa 15W-40 (reasonable synblend, quietest, availability can be spotty)
3 - Delo 400 LE 5W-40 (least expensive synthetic, good performance and noise, available everywhere)
4 - Rotella T6 5W-40 (mid-cost synthetic, noisiest synthetic, good performance and available everywhere)
5 - Delo 400 XLE 10W-30 (least expensive synblend, noisiest synthetic blend, available everywhere)
6 - Motorcraft 10W-30 (expensive conventional, available most everywhere, performance not known)

If you choose to use Delvac 1 ESP, you cannot go wrong with it, but the Kendall is great too. In fact, I do not think any of the oils in the list above are "bad" and all of them will give a long life. Pick one and use it or use all of them.

 
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