Why is oil coming out around the muffler gasket and the muffler?

I hwve oil pouring out around the muffler gasket and the muffler itself. Replaced the gasket but it's still doing it . The mower will run done for a few seconds then it will blow blue smoke out and die , but will start right back up again. What's my problem ?

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@danny1974, Danny, Check to make sure you did not overfill the oil/crankcase, make sure oil has not been diluted with fuel(carb. leaking gas into oil) and that proper grade oil used and dip stick secure. The problem could be a blown head gasket,bad valve/guide, crankcase cracked or breather plugged(if equipped), excessively worn piston/rings. Links below may help. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

https://www.briggsandstratton.com/na/en_...

https://www.youtube.com/watch?v=bc0gfCds...

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