mower engines with filters

The post below got me to thinking about my mower engine.
I am fairly new to these mower engines with filters.
My assumption is there must be an oil pump with an adequate sump.
So what happens if I mow on an incline?
Is there a measure as to how fay up the incline I can mow?
The incline is probably around 30*.

Pressurized rather than splash lube systems are filtered and boast 30 degrees with no problems, one would assume on a full crankcase....I keep mine full just in case. My take is by using synthetic oil, if I go dry for a bit, it won't matter as the film will last through the dip, hill, or whatever. My pond dams are right at 30 on the dam side and some places more than that. I mow lengthwise as I have obstructions at the bottom of the dam which prevent vertical mowing. Been doing it for about 30 years now and have had no problems.

Back in 1988 I had a Ford F150 305 (30 something cubic inch V8....5 liter). I used the multigrade dino oil specified for it and kept the oil and filters changed regularly. Every time I changed oil, even having run the truck prior to the change and always filling the filter till full (takes several times adding oil to get it full), I would always get a dry valve rattle just before the oil pressure gauge started to register.

When I decided to use syn oil, I think it was Mobil 1 and I know it was the same viscosity. Never had the rattle again using the same fill techniques drain intervals, and driving habits. That sold me on syn.

Not sure on the twins, but on a vertical shaft singe cyl engine, with the oil level at the full mark, you could mow at more of a tilt than you wanted to ride.

Don't recall where I got the info but my primary bank mower, a stock Husqvarna 46" twin blade, conventional rider, with ATV knoby tires had a single 20 hp Kohler engine for 700 hours of it's life which had pressure lube. Had no slope problems with it. The engine was a Courage design and being a single cylinder of that hp on a very open (few braces) cast aluminum crankcase design, vibrated itself to death....3" crack in the crankcase casting causing oil to leak out and couldn't keep the bolts tight on the mating half. The BS V twin is really smooth.

The tires hold me on the bank and with that type mower, all I have to do is move over on the seat to the uphill side and be on my way. Works great for me.