I recently took my 2013 F-250 diesel to a local dealership for two towing-related concerns and an oil change. I live in Phoenix, where it's >100 degrees every day.

After getting home, I found they used 10W-30, so I called to inquire. The shop manager told me they use 10W-30 for everything and the new Ford 10W-30 blend is now recommended for all temperature ranges. I called another dealer who said they use 15W-40 in this environment.

My service manual recommends 5W-40 oil for severe duty, including towing and high temperatures.

Has the oil technology changed and did Ford publish new severe-duty oil standards?

 

No, not aware of it changing. Most dealer/Quick Lane use what they have regardless of what you ask them to use or the driving conditions. My last oil change at QL was suppose to be with 5w40 full synthetic since it was paid for with a maintenance plan. Got ready to leave and and it said they used 5w30. I had them drain the oil, change the filter and fill with 5w40 since that is what I asked for when they took my "order" for service and the maintenance plan paid covered.

 

 

Here's the list of oils which meet Ford's WSSM2C171-F1 specification specifically for the 6.7L, and the almost three pages of approved 10W-30.

 

 

It's unbounded on the top end in the manual for normal usage. I'm not saying I'd use it where the OP is, just that it's the normal usage 6.7L oil and Ford approves its use contrary to an above statement that there are no diesel rated 10W-30 oils.

 

The service advisor and the service manager tried to convince me the 10W-30 is now recommended severe duty use in a 6.7 diesel, but they couldn't show me where Ford recommends it in writing.

I'm not unhappy. I learned that they either have bad judgement or they can't be trusted - all for the cost of an oil change.

 

There are plenty of 10w30 rated diesel oils. 10w30 is oil in the truck when comes from the factory.

 

I would change that oil out for 5w40 syn if it was my truck it even says so right on the oil cap. If you don't fall into the severe duty as outlined in the owner's manual then you should be fine even at those temps.

 

I find it a bit bizarre that Valvoline has not been mentioned in that list of "diesel" motor oil aside from only two listed as "all-fleet".

 

The first several iterations of the list were missing all of Shell's Rotella products, probably just hasn't been blessed by Ford yet. Or they're the brand that doesn't have enough phosphorus, which is what Ford is specifically targeting with the standard apparently.


https://noln.net/2017/08/21/clearing...oil-statement/