This reminds me of one of my neighbors who services his own vehicle.
One day last summer, he came over and stopped me on my lawn tractor and asked if I could tell him why he didn't have a reading on his oil dipstick.
I asked if he knew how much the engine took and he said he'd followed the owners manual specs.
Lemme have a look I said. Walking up his driveway, I saw the car with the front wheels up on the ramps.
I'm thinking to myself, Oy Vay, remembering the time I did the same thing but fortunately discovered the problem when I realized I was reaching pretty high to put oil back in.
Take the car back down off the ramps, let it sit for at least 15 minutes and check it again.
He looked at me sheepishly and I told him not to worry, I wouldn't tell anyone.
Don't forget the amount the filter holds.
When I'm towing my travel trailer (with my '02 Tahoe) down south and pull in for gas and a leg stretch, I don't check the oil level until AFTER I fill the tank, and even then If the oil shows down 1/2 qt/L, I leave it alone as I know I'm NOT going to get a proper reading.
In reality, oil dipstick readings won't show the proper level when the engine is warm or hot, due to the engine not sitting shut off long enough, AND/OR the vehicle isn't sitting level.