If your not due for an oil change I wouldn't change it. Just pull the oil filter cover off and look at the oil. If it's still brown, it's good. If it looks like Kalua and cream, put the cap back on and grab a beer and figure out who is going to take the heads off.

As far as the antifreeze, if you don't see any white or greenish white stuff caked on the items I mention before, pull the engine cover off. Look down through the intake manifold onto the top of the engine block with a flash light. You should see a silver colored pan under the manifold. If you see green you have found you antifreeze leak. That would be the valley pan.

If you still can't find the leak pull your spark plugs. If your head gasket has failed from a water jacket into the combustion chamber the spark plug for that cylinder will look clean, bright white and brand new. What happens is the anti freeze steam cleans the entire combustion chamber. Unfortunatly that means the oil lubing the cylinder wall goes too.

If this has happened and your oil is not white, that means the water hasn't reached the oil yet. A good thing. Your rings are still in one peice. If your still interested in confirming the obvious, you can do a compression test; But, if you find a spark plug that looks brand new compared to the other seven I would just refer to the last sentence of the first paragragh.

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2007 Suzuki Vinson 500 4X4
2007 Toro 6.5hp
2006 BMW X5 4.4 ltr (his)
2001 BMW X5 4.4 ltr (hers)
1994 Honda XR650L
1984 Honda XR80

"Beer is proof that God loves us and wants us to be happy."
Benjamin Franklin