full leathers, you lucky bugger thats a rare optional extra!

i'd guess warped discs too mate.

throttle pedal vibration is to do with the throttle cable, it was fixed by ford in later models with a longer cable. you might be able to re-route it slightly so top it touching whatever is vibrating it.

the injectors are very noisy on th 1.8 and 2l black top zetec e's and seem to be louder on the st170. definately check the oil though and if its due a service then change it. you'll want a decent semi or full synthetic 5w/30 same as the 1.8 took.

if its leaking oil you need to find the leak first before you can work out how to fix it

i think there a sandwich plate where the oil filter is to feed the oil cooler and the ipes on that can corrode and leak so it might be that. if it is then you'll need a new one along with new oil and filter at the same time.