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Switching oil concerns

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Old Jan 28, 2021 | 02:19 PM
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Switching oil concerns

I have a 2003 6.0 and have been running 5w40 synthetic. Put new injectors in last October and the manufacturer is telling me NOT to use Rotella T6.

Question is.....If I switch to a 15w40 conventional pr synthetic blend, will there be any possible issues??
 
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Old Jan 28, 2021 | 04:07 PM
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Here is another question....Ford has approved the Delo Isosyn 10w30, but not the 15w40?
 
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Old Jan 28, 2021 | 04:25 PM
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I’d post your question in the 6.0 forum.
 
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Old Jan 29, 2021 | 08:35 AM
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I don't see why they wouldn't want you to use Rotella T6. That's all I ever ran in my first 6.0, and I NEVER had injector issues (well, not with the injectors themselves - ICP/IPR is common though). My 2nd 6.0, I was coerced into running 15W40 and ended up getting stiction, so I added Archoil AR9100 and it helped, I never did switch over to T6 before I had 2 injectors crap the bed on me.

The only reason I can see them telling you NOT to use T6 (which is what most guys use, last I knew) is because they want to sell you more injectors.
 
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