Ok guys, thanks of all the great info and advice. I think aside from that loose wp bolt the tb system all looks ok - the black stuff on the belt was more powdery than chunks, so maybe just gradual wear and tear. Everything seems tight and the camshaft pulleys line up just right. BUT...... I think I get the dunce award for this one - as suggested i did accidentally drain the transmission fluid rather than the engine oil (wow...., and im studying to be an engineer??), and overfilled it with new oil. You learn from mistakes hey? It did seem odd that the 'oil' after 5k miles was not black but rather red, dont know why that didn't stick in my head. So from here am I ok simply refilling with transmission fluid and putting her back together? Or having driven without the fluid could I have done some serious damage. Also is there anything else worth doing while im at it, ie spark plugs, or any of the tb stuff (if it isn't broken)? Thanks again for all input Zach