1989? Briggs Quantum Carnage

[Japanese]

Three separate pieces, but the bolts are also pretty loose so there may be more cracks. I'm guessing the motor got the typical Briggs treatment most of it's life, straight 30 tar that was rarely of ever changed or topped up, when it was running it was smoking out of the crankcase vent

What oil have you run in it those 2-3 years of ownership and how often it was changed?
Why are you guessing about the SAE30 oil and that have never been changed or you're talking about the previous owner?