On an incline or decline while the engine is running internal lubrication will stay pretty much the same as long as there is the recommended amount of oil in the engine. If you are low on oil then you can run into problems on steep hills or on hard turns.I have to say that I'm not a licensed auto mechanic, and that's why I have quite a few of strange ideas & questions. Appreciate for educating btw.
just a few more questions: when the car is reving high on 45 degree uphill incline, does it mean the rear camshaft would get more oil lubricant than the front camshaft due to gravity? do the camshafts actually rotating at high speed? do they consume heat? do the cams wear/worn? are they able to last 20 years plus(without shape change)? when we make a fast 60mph turn (270R clockwise), does the gravity push most of the engine oil to the left side?