Originally Posted by EastCoastCB
I know I'll not be that guy with a bus that "started when parked 5 years ago".
No, you will be the guy with a messed up engine from short cycling it.
I would never buy a bus from someone doing so.
It's like buying a car from someone that only ever drove it to the store a block away. The engine would be toast, but the rest of the car would be low miles.
Far more damaging than leaving it alone.
I'm starting to see why your engine starts so easily from small 12 volt battery's. I wonder how much compression is left in each cylinder. Newer, factory compression engines take far more power to turn over when starting.
Your engine is likely has vary low compression.