I recently (two weeks ago) bought myself a ZXR400 and it rode perfectly for about 600km.

Since today I'm dealing with 2 issues:
First issue: the two remaining panel bulbs have blown (speedometer bulb had already died when I bought her) and the rear light doesn't work anymore, only when you are braking. Found out because of police pulling me over while on my way to work. But that's something for later. The second issue is what troubles me most.
Second issue: Well, I guess this picture says enough.

I had already bought new clutch plates and semi-synth oil which I was going to place coming saturday, but that seems like a waste of oil if it will turn into sludge again. Could someone tell me the common causes for this issue and perhaps give me a link as where to buy the failing parts? I could not find any engine-related parts over here in The Netherlands.
Your help will be appreciated!

Also, can I still ride to work (1 hour total back- and forth) with this sludge? The temp meter barely goes above the blue bottom with this weather.