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You most likely lost your head gasket or you water pump and seals. if you have oil in the radiator it will be more likely a head gasket at the pressure from the motor will force it that way the motor will run and still have good compression as long as it is just starting to fail , if it is water in the motor (milky white oil) I would look towards the water pump... either way as long and you get it fixed quick at least dump the oil, and don't ride it you should be ok.

2007 4 x 4 400
Exhaust mod.

Pending changes
TRV seat
650 Rear shocks
400 front shocks.
snorkel (still undecided)
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