There is no such thing as Delo 400 oil. It is a marketing name used to describe whatever Chevron is selling at the time. The Delo that you ran before 2016 is different stuff than what you get today. It is no longer adequate to describe the oil by what it says on the FRONT of the bucket. You need to include what's on the BACK of the bucket. Note this pail of Shell Rotella. It is CK-4. Note that CK-4 has been REJECTED by Ford for ALL diesel engines. See the Position Paper attached. The giant mess enabled by the API back in 2004 for gas engines has now migrated to diesel.
And yes, Delo 400 CK-4 is fine for your roller 347.
Isn't this all just marketing. Forcing oil manufactures to pay Ford for printing their specification on the label?
Like many other diesel engine manufacturers, with their own internal OEM specification, Ford will now be recommending oils that meet an OEM specification, Ford Material Engineering Specification WSS-M2C171-F1. The customer should use an oil showing that it meets this specification.
Didn't GM do this a few years back with the "dexos label?
I run into this with my 14 Shelby GT500. Only oil in the world that meats Ford's specifications is Motorcraft...LOL....I can BS......I THINK Castrol EDGE Super Car has the specification but due to availability I'm running Motorcraft. I have to order it because not even the dang dealer has it in stock....LOL
Been running Shell Rotella T4 in my 2500HD for 10 years.....not a single issue thus far....
Tim