Does it make a difference if you check the oil level on a uphill driveway?

2003 Ford F150 xlt 5.4 v8 125 000 miles
Some one checked it on a uphill driveway 5 minutes after driving for 30 minutes and said it was 3 quarts low…
Common sense tells me it's going to give a bad reading but for the sake of this person to understand why from the mechanical community please explain why… Thanks for your info…

Of course it is going to make a difference. Check your oil level on anything but a flat surface and you will get a false reading. You should also wait at least 30 minutes after the engine has been running before you check the oil level. It takes time for all the oil in the upper part of the engine to run back down into the oil pan. The reason you get a false reading unless the vehicle is parked on a level surface is because the oil will pool at the lowest point in the pan. If it all runs to the side opposite where the dip stick enters the oil pan it will give you a false reading that it is low. Conversely if it all runs to the side where the dipstick is located it will give a false reading that it is overfull. Rule of thumb: Park on a level surface, wait 30 minutes after the engine has been shut off, remove the dipstick and wipe it clean, reinsert the dipstick all the way in and then immediately remove it. Hold the dipstick horizontally and read the level.

Always check your oil on a level surface. The dipstick measures oil at one point in the oil reservoir. The angle of the vehicle will affect the reading. Whether the engine was hot or cold will not make much difference. Oil is a liquid and it seeks its own level, just like anything else.

Yes it does because if the truck is facing downhill the oil pan will have all the liquid in the back. But if it's leveled the oil will be leveled as well.

Get a full glass of water, hold it over this person's head and tip it sideways and tell him that the mechanics of fluids caused gravity to pull the water to one side of the glass and fall out on his head.
Unfortunately I don't think you're a troll but they actually gave you a drivers license?

Also, it can take several minutes for all of the engine oil to drain back down into the pan, depending on the type or engine.

Get a bottle and half fill it, replace the stopper then lie it on it's side.

That's what the oil in your sump looks like.

Now lift one end up slightly.
That's what your oil level looks like when parked on a slope. Don't forget the dipstick will probably be in the raised part of the bottle.