Re: Oil level
Between the high point and low point on a dipstick is usually about a litre of oil, you can run low oil as long as you drive the car nicely, lots of oil is mainly for big revs, and for corners so the oil pump does not run dry and the engine stays lubricated.
Sound slike battery for the starting problem, and only just starts after fuel has been primed and pumped in, next time it has been sitting, jump start it, and if it fires first go, thats the answer - new battery.
I did put something here, but it vanshied, I think
"So long and thanks for all the fish!"