YIKES! More confusion! BTW,
chris142, I know that 'STP' is now the Autozone 'House Brand' and the STP oil for gasoline engines is very inexpensive but who is "wpp?"
The following article and documents might help to clear up some confusion:
Clearing Up Ford’s Diesel Oil Statement
August 21, 2017 by
Staff Writers
https://noln.net/2017/08/21/clearing-up-fords-diesel-oil-statement/
Updated Ford Motor Company CK-4/FA-4 Ford Position Statement:
https://www.flsheriffs.org/uploads/docs/January_2017_Updated_CK-4_Position_Statement.pdf
Here is the Ford Motor Company List of
WSS-M2C171-F1 Approved Oils
(10 pages .pdf) updated Aug. 1, 2018
. Scroll down to the viscosity oil that you use. 15W40 is about half way down:
https://www.fcsdchemicalsandlubricants.com/main/additionalinfo/dieseloilsWSSM2C171F1.pdf
I recently changed to a Synthetic Oil
made from Synthetic Base Stocks Milesyn 15W40 by a company that I trust after doing some research, named Miles Lubricants.
It is not on the Ford WSS-M2C171-F1 approved oils list (yet) but I am not concerned. It has LOTS of certifications from many manufacturers including an older Cumins 30,000 mile extended oil change interval certification. My objective is extended oil changes using the 'MicroGreen' oil filters that have a patented internal bypass filtration down to less than 2 microns.
This oil has a CJ4 certification as well. I doubt if they have changed the formulation of this synthetic in the manner that Ford suggested that some oil makers did for their CJ4 oils.
I spent way too much time researching synthetic diesel engine oils (months) before I made my final decision. I bought 5 gallons of this oil, enough for my next oil change and
I'm going to use it no matter what Ford Motor Company says!
After changing to this synthetic my LOW IDLE speed INCREASED by 125-150 RPM which indicates less friction, better lubrication and probably better performance and fuel economy. I certainly don't think that I have any problem with lubrication as Ford suggested! After 400 miles I finally turned the idle screw (hidden right next to the injection pump) down 1-1/2 turns and the Fast Idle Solenoid rod down to match it just to get down to around 650 RPM Slow Idle. At some point I may contact the oil manufacturer and see what they have to say about this recent change in Ford oil specifications.
It also looks to me, from their own document linked above, that this new specification was created for the new Super Duty diesel engine that was introduced in 2017. I would not be surprised if Ford has been having some lubrication issues in their newer engines, from the 2003 6.0 and up.
This seriously makes me wonder if this new specification is even useful for or applicable to these older IDI engines. Of course they are going to say "For All Ford Diesel Engines" They'll make more money by selling Motorcraft oil with this new specification to everyone, whether it's actually needed or not.
Personally, I don't think that Ford Motor Company cares much at all about these old IDI trucks and will probably be pleased when they are all off of the roads and recycled as scrap metal so they can move more newer trucks into the market.
Whatever the case, that long list of approved oils will help anyone who wants to buy oil that is approved for this new Ford specification.
When I was researching oils I noticed that a lot of them did not
list FORD certifications/approvals on the labels when lots of other manufacturers approvals were listed. I wondered WHY? I thought that maybe it was because Ford was not an easy company to deal with during that time frame or maybe Ford was having diesel lubrication issues that hadn't been sorted out yet. Also, I know that it costs a significant amount of money for a company to run their products through testing for certifications and approvals and they don't
need to have every certification and approval that is available. I think that once they get "this many" then that is enough. Wherever they decide to draw the line.
Sorry this post was so long.
