rear main started leaking ?

looking through spark plug hole i notice some grime around the bore. so i sprayed wd 40 on top of pistons a few times and let soak a few days drove in one day and then change the oil . now oil is coming out rear main what can i do thanks randy
 
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ok i forgot to change oil new it had wd 40 in it didnt think would matter much . wrong started leaking bad .so i change oil and filter new a little over 5 gallon jugs of oil 17.99 not bad.with filter change though be ok but came 1/2 qt over. will take some oil out see if still leaks thanks
 
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