I don't understand how a BS vertical crank engine can starve for oil on a hill. No matter which way the engine is tilted, the oil is still in contact with the dipper up to at least 30° tilt on the away side of the dipper. Are you running detergent oil?
I'm sure the main problem here is the splash oil system, it runs most times on fairly steep hills. All of these small engines are the same with the oil, never seen one yet that had a pump & filter. Years ago they made 2 cycle lawn mowers, if they still did I'd buy one in heart beat. 2 cycle doesn't care about hills and run on steep ground, could run it upside down if ya wanted.
Took one mattress across town, moved 2 today, Got an EKG, Doc takes me off plavics. Looking for a LED TV. Been trying to fix the samsung that just quit. Get some squamish cells removed from hand Wed. Fortunately got the spare BR plumbing fixed already - new faucet, commode valve and shower head. City replaced meter a few years age and things get plugged. Plus a incorrectly assembled Delta valve from the factory! Will be >102F all week and NO rain.
Ahhhh, finally starting to thaw out. Feels good. I actually got pretty well thawed on Sunday under a welding helmet in the afternoon sun. Heat gun on the tubing in the sun read 146°F, way to hot to touch without gloves and can't hold for long even then.