Lubricant grades: engine oils

Trying to avoid longish trip to the "local" Citroen garage, and the cost of the Citroen-recommended Total product, I got the local motorist's shop to obtain some 5W-40 oil for my C3 diesel.
Yes, it is indeed (synthetic) 5W-40, like the recommended Total Quartz Diesel 9000. What troubles me is difference in the more minor parameters of the oil.
The oil I have is API CF; the recommended product is API SJ/CF.
The oil I have is ACEA A3/B3; the recommended product is ACEA 3.98/B3.98.
Has anybody any idea of the nature of the difference implied by the different letters an numbers? A search of the web has yielded no answer.
I haven't used it yet- and will refrain from using it if I must.
Thanks in anticipation, Colin
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you'll be ok i.e. API CG is better than API CF and so on. Looking in my Haynes BoL and interpreting the data therein I would say that the A3 is a petrol spec and B3 is for diesel engines. For example the Xantia petrol needs ACEA A3.96 and the diesel needs ACEA B3.96 (I also presume the 98 or 96 is the year of the spec).
So it looks as though you may have an oil rated to go in both petrol and diesel cars. It's up to the spec required so you shouldn't have any problems (usual disclaimers apply).
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Malc

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