The oil started leaking out of my coil on my VW. Is it safe to drive like this? What purpose does the oil serve? cooling?

Are all 12 volt coils the same?

Thanks,
Paul

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R