If that much coolant went into your oil the radiator would be pretty much empty.

Fuel can get in from the lift pump in theory, but it would take a while to fill a couple of gallons, probably more than 500feet.

Drain it and figure out what it is. If fuel, the engine is probably not toast. Overfilling with oil/fuel can lead to a runaway which is the biggest risk.

__________________

Gone to the dark side

- Jeff