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I have a Ford Transit with DPF, first registered in 2011. The Ford engine oil specs are as follows:
Ford WSS-M2C913-C
Fully backwards compatible and is strongly recommended for all applications that currently require the specification Ford M2C913-B. The new engine oil provides various benefits to the customer such as improved fuel economy benefits and high robustness to biodiesel fuels.
Ford WSS-M2C913-D
Introduced in 2012, oils meeting this specification are recommended for all Ford diesel engines except Ford Ka TDCi models manufactured before 2009 and Ford Galaxy 1.9 TDi models manufactured between 2000 and 2006. A product meeting this specification is especially recommended for diesel engines where M2C913-B or M2C913-C oils were initially required. An oil meeting this specification must be used in Ford Transit vehicles manufactured from 2012 onward with Duratorq 2.2 engine. Oils meeting this specification can be used with extended oil change intervals and are also suitable to be used in engines running on biodiesel or high sulfur diesel.
Ford WSS-M2C934-A
Extended drain engine oil for vehicles equipped with diesel particulate filter (DPF).
I think the correct oil is the 913D, as it is very specific about Transits with the 2.2 Duratorq, but am a bit concerned about the 934A. Am I overthinking?
Any of those would be fine, more important is regular oil changes. I'm really not a fan of the 20,000 mile intervals, especially on diesels over a couple of years old.
If you are not prepared to experiment stick with the recomendation, that's what the testing was done on. Some Ford engine oils shear down to help meet corporate emisions - if the engine wasnt designed witht that in mind you could experience premeture wear especialy if your van is carry alot of weight.
Also later oils have less additives to prevent boundary wear because they damage emissions systems - early engines may suffer increased wear if you dont use the older oils.
Backwards compatible may be a marketing term for use with out of warranty older engines to reduce stock levels at dealers. Or it may be tested and established. Oil companies are portective of the oil make up and performance so the only way to really tell is to try it which could be very expensive for you.
I would go with the recomended standard for your engine but not necessarily an 'approved' oil.
Look on oil manufacturer web sites. As a general rule if an oil for an older vehicle meets more oil standards for various manufacturers, then it will have better aditive packs for protection. Oil for new standards is often maufacturer specific.
I have been over thinking, a lot. My printed handbook, 213 pages ALL IN GERMAN, says 913C, but D has superseded it. I have ordered some Mannol 7707 which meets the 913D spec, and is sold by Mannol as a Ford OEM oil.
EDIT: It is a 3.5t motorhome, so mileage isn't the killer, especially this year, but it does chug along loaded.
Thanks for your input, advice and reassurance
