Would you consider posting a pic of your 544 and 220? Well, I don't have anything recent, but the cars really haven't changed any since these were taken. I copied them from my postings on another "Volvo friendly" website many years ago. I just don't take many photos. The PV544 was when I ...

I don't think oil viscosity is the issue. I would not rely on estimating a 100 ml (3 oz.) loss by the dipstick. I'd guess that just surface tension could indicate that small amount. 700 ml (24 oz.) loss in 300 km (186 mi) is a lot. I'm surprised you haven't seen smoke (other than startup). I have fo...