Diffcult.
Depends on whether volvo did or didnt tighten up the engine when revising for euro 4, but then there are other things involved too.
Basically it should be ok yeah, but I'd advise only shell helx ultra 5w40 since it is a thinner oil, if there were intermediate numbers it would be a 2.5w35.
Thing is, the viscosities have a range, most 5w40 are at the thicker end of both 5 and 40, whereas a 0w30 resides at the thinner end of 0 and 30, thus the change to 5w40 is pretty big. The only exception I am aware of is s.h.ultra which is at the thin end of the 5 and 40 range. Tbh a 0w40 such as Fuchs titan longlife 0w40 ir Mobil fs 0w40 would be a more appropriate transition.
See the table ill attach to get an idea where Im coming from. The castrol is the std benchmark oil, now this is A3/B4 0w30 (no longer available) but the viscosity of the A5/B5 is about the same, just the hths is lower, so still representative of your original fill.
The fuchs and motul 5w40 are typical of pretty much all 5w40 viscosity wise.
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