Re: fouled spark plugs
Well at a guess, I would say the piston rings are gone if the plugs are getting oily and it's using a lot of oil. It could also be the head gasket leaking slightly.
My 1.8l 8v is on 122K and has been absolutely blootered from new (it was an Alfa demo car before the last owner bought it, then I bought it 50K ago) and the engine is still great.
Hopefully it's the head gasket as it's easier to sort, but I fear it may be the rings I'm afraid. Sorry I hope I'm wrong.
If the plugs are oily, you can clean them and reuse them no problems.
BTW...this is ONLY if the plugs are oily again !!!!!
Let me know what they are like and I'll be able to give you other/better fixes if they aren't oily.