Well i have a 180sx sr20det redtop,
mite be bad petrol lad
if it is petrol thats getting into your oil it could only be piston rings gone or hole in piston or cracked block which is allowing the fuel into your sump. if its not petrol , check your head gasket it could be letting your coolant into the sump.
start with a compression test and that will let you know if im on the right track.
Sig pic removed (size) - Admin
did you leave it out in the cold weather by any chance?
Any water in the oil/oil in the water?? Sounds like what happend mine
Do a compression check, its the only way to make sure the engine isnt fucked
hopefully its only a leaking injector or somethin