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Which one should I use in a 7.3 OBS? Everything out at the farm I work at we use JD oil...on EVERYTHING, but never used in a 7.3. They only run Rot or Mobil Delvac on their 7.3. This is my first &.3 Powerstroke and I know they are picky on the oil to be used. Any help would be great!
:ford:
 

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I used to run Rotella in mine but swiched to the Delvac about 20k miles ago. For some reason the Delvac does not turn black near as quick as the Rotella does. Delvac at 10k looks like Rotella at 3k. Bout to send the last batch off to get tested and see how it is with 10k on it.
 

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holy fuk, i would never run dino oil to 10k miles let alone rotella or delvac... i assume its dino and not synthetic... ive ran just about every dino oil through my truck and the two that run the best is chevron delo and valvoline premium blue, valvoline premium blue is the best dino oil you can run do to its additive package... i think delo is third on the list. but when i used motorcraft, kendal, rotella, and delvac the cold starts and idle characteristics went to chit after 1k to 1500 miles and it smoked a little at idle and consumed more of it also. about a quart every 2k miles... the chevron delo and vpb idle didn't really change a lot till around 3k-3500 miles for the delo along with consuming a quart every 3k miles.... 4k-4500 for the vpb and consuming a quart every 5k miles..
 

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Didn't run it that long on purpose...thought I had changed it earlier last year but got it mixed up with my other truck. Yes it is dino oil. That being said at 10k the truck ran no different than when I had fresh oil in it which is partly why I didn't think about an oil change. It used 2 quarts in that time period which was also due to some slow leaks on the hpop lines.
 

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i use rotella, so does my dad in his OBS, he used to use the chevron stuff but has been useing shell rotella for the last probably 5 years or more, no injector issues or o ring issues at all, the rotella is all i use in my truck aswell and no injector issues either....
 

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you guys can run whatever you want... i will only run VPB or if i have to delo..
 

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If its the right weight I would just run the JD oil and do 3k mi OCI, Ive seen farm trucks run forever on JD oil, aside from that Valvo Premium Blue gets my vote.
 
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