Let me first tell you, the carbon that you see in any oil is from three sources:
1) Unburnt or Burnt Fuel.
2) Burnt Oil.
3) Deposits getting dislodged from piston.
You have not changed the carb settings so rule out 1.
2) Burnt oil - Whenever I used FS oils, the color changes quite late.. this is the observation not only my vehicles but many others too. These oils do not breakdown that fast. Some ppl drain it as good as new. So one thing is for sure, the oil that you are using does not break as fast as minerals. Hence the colour has not changed after 1000 kms.
3) Deposits getting dislodged - You want it , No? Actually when you have changed to this oil these deposits are getting dislodged and that is what is appearing on the strainer. It appears that the previous oil had left sludge which is showing up.
You should discontinue using any new oil when your engine heats up quickly, when you get burning smell from engine or you hear some strange sounds from the engine eg. rattling, or you see smoke!! If nothing of this sort is happening, the oil is doing what it is supposed to.


...!!! So, I was wondering if the chemical composition of the FS oil damaged the gasket/seal or if it is a mechanical problem.. BTW what was reason behind the oil leak in your xtreme..??
which was pure horsec*** to begin with.
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