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Should be no problem at all as long as you're not doing this in extreme cold weather - in which case stick with the 5W30 until things warm up.
And if I recall correctly (no guarantee, there) Volvo recommend 15W40 for warmer temps but not 10W40. Many years ago (early 80's) GM issued a service bulletin advising that they were having problems with customers' engines using the 10W40 oils of the time. They saw unusual frequency of piston ring sticking and resulting warranty claims, which their engineers felt was due to the large amount of additives used to get that wide 10-40 viscosity spread (actually called 'viscosity index'). They told their dealers and service people to discourage customers from using 10W40. Maybe that grade has gotten better, but I stay away from it.
My approach is to use the lowest viscosity (thinnest) oil that will still handle the hottest temps I expect to see before the next oil change. For me that's Mobil-1 5W30 for colder weather, then 10W30 (or 0W40 when I can find it) for summer.
So how can I justify 0W40 when I say 10W40 is too big a spread? Synthetic oils are a very different ballgame, and obtaining that spread does not require the same chemical wizardry as conventional petroleum oils do.
You can learn a lot about engine oils and the standards they meet by going to the American Petroleum Institute site and mousing around until you find the 'lubricants' pages.
--
Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar 77 MGB, and numerous old motorcycles)
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