Your plugs look OK as far as deposits go. Maybe it's the camera angle but the gap looks way too wide on the left one. I have had good results with the OE Volvo triple electrode plugs...about $22 for a set of six from FCP Groton.
My S90 has 227,000km (141k mi). I occasionally see a slight puff of smoke under certain conditions, too, but it is usually only down 1 litre at oil change time. For me, that's every ~12,000km (7500mi) using Mobil-1, 5W30. I have had new cars use more than that, and still be within the "normal" range according to numerous mechanics.
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Bob: son's 81-GL, dtr's '94-940, my 83-DL, 89-745(V8) and 98-S90. Also 77-MGB and some old motorcycles.
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