leaking crankseal causing car to judder??

[sammyhale22]

My mechanic mate reckons the judder from standstill might be caused by crank seal leaking oil onto the clutch. He hasn't looked at it yet though so he's just speculating. I`m not losing any oil though. I`ve noticed alot in here put the judder down to problem engine mounts? Can it be a coincidence that i have just fitted powerflex bushes on my dogbone and the judder has appeared after a couple of weeks driving? :S

Samuel