Hi, oil leaks are standard, no delete option, but they are anti rust. Re the slipping, could it have been the clutch? Did the engine speed up and then it seemed to ' grip' again. If so clutch slip is normally the sign of a worn out clutch, top gear typically is where it makes its presence felt. Try driving up a hill in 5 th then briefly dipping the clutch. It should grip and jerk you forward. If you get an effect like an automatic, thats clutch slip, or it can be caused by the dual mass flywheel,ease off the throttle, and change down. You can nurse it around like that for a bit but you'd need a clutch. On rhe other hand if its jumping out of gear it may be something worse.