Crank it with the fuel shutoff down, if there's a cylinder with no compression, you'll hear it in the cranking.

Might be that the oil somehow got overfilled, possibly a fuel leak into the oil or something, just driving down the highway and it starts puking oil out of the dipstick just sounds more like either overfilled crankcase hitting the crank or maybe a clogged breather system pressurizing the crankcase. I'll bet lunch that it isn't a cracked piston, call GAS and get the compression numbers.

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Gone to the dark side

- Jeff