Sam, your pic 3 shows damage very similar to the previous B18 in our Amazon a few years ago now. The car had pinked a fair bit previously (but not my car so could only comment...) but whilst a passenger again on an ordinary drive lots of fumes began coming up through the gear lever gaiter so we stopped in a layby. Lots of oil everywhere but it seemed to run OK so we limped home.
Next day head off and we find one piston holed, one damaged by bits of valve seat (!) and two with ring-area side damage through what I consider excessive ring gaps. Also all bores damaged, with bits of broken rings everywhere: conclusion economic scrap.
Unleaded engine now in car - that has to be the way to go, but I guess the timing was way-out too (but as I said not my car....).
Paul (glad to see you are still into Volvo's)
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