The 185 is euro 4 engine which uses A5/B5.
A is petrol spec, so you only need concern yourself with B spec for diesel (they both go together anyway so this is moot).
A5/B5 has nothing to do with dpf.
A3/B4 is high hths full saps, used in euro 3 D5, A5/B5 is low hths full saps used in euro 4 to try and help fuel economy at potential expense of protection. Tbh either are fine, just avoid C spec as despite being mid or low saps they can cause more trouble with these dpf's (long story...) despite being designed for dpf equipped cars...
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