Forum Discussion

F5Pro's avatar
F5Pro
Explorer
Feb 28, 2020

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

Just curious about what oil to put into my Powerstroke. Book calls for 5W40 (full synthetic) for towing 1000 miles. Local Ford dealer uses 10W30 as standard oil change oil. There are other diesel oi...
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ShinerBock's avatar
ShinerBock
Explorer
Feb 28, 2020
I would go with the 5W40. The early 6.7L Powerstrokes had very tight bearing clearances(3/4 the size of a human hair) and were known to spin bearings in colder climates using heavier oils like 15w40 or 10w30. Also, due to oil routing design, it takes a lot longer for the thicker cold temp oils grades to get to many upper parts of the engine.

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