The balance shaft bearing issue is a big deal and worth an inspection by someone familiar with Volvo V8s. The problem has a remedy by removing upper intake and drilling the drain hole that 2006 and later have with a long drill bit. It is not a big job but the drilling only goes 1/4 inch to go into a...

I have the same XC90 - I agree with the other posters - the issue with the balance shaft bearing is due to washing the engine, or in my case, I think I got some fuel in there when I changed the fuel pressure sender. To fix it, you have to remove the intake manifold and one of the cylinder heads. Tha...