You'll see that stuff on almost ANY engine that uses normal petroleum based oils. In itself, that won't be the demise of your engine.
Now, the cleanest engine looking components I've ever seen on dismatelled engines came from engines that used Amsoil (dismantelled for reasons not related to oil either btw, like a bad head gasket, not a Volvo). I now use Amsoil in my cars.
I see that varnish in most engines but other than coloring the parts, I can't say that it's the reason why any engine might have oil related problems in later life, assuming that oil is changed as often as need be.
So, don't worry about it.