As the title says the problem, any idea what seals need to be replaced or the cause of the problem? Also I know there is pressure building in the crank casing popping plug 1 and 4's wire up. Any help with my problem will be much appreciated.

 

Water in oil = cracked head, blown headgasket, or cracked block. Oil in spark plug tubes can be due to excessive crankcase pressure stemming from blow-by or spark plug tube seals need replaced.