To where? Is there a great big hole in you engine block? In the oil pan? You could likely add an additional quart and it would have no effect at all.
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What would happen if I added 2 quarts? A gallon?
The crankshaft might start washing through the oil and making foam thus destroying your engine.
The crankshaft will definitely wash through the oil and make tons of foam thus destroying your engine.
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F does not mean the engine is “full of oil”, it simply means it’s up to the highest recommended oil level. On an idling engine, that extra oil needed to fill the oil filter will do no harm and it will quickly drop to “F” as the engine idles and the oil filter fills up.
The oil level doesn’t have to up to the “F” mark, being between the F and add marks is fine. As long as the oil pump’s pickup tube is in the oil to pick it up, the engine doesn’t know the difference. The oil sump is just a tank to hold the engine’s oil supply, the oil pump pumps the oil to the engine to lubricate it. Splash oiling is only used in antique cars and lawn mowers.
Some engines even have a separate oil tank where the oil waits to be picked up by the oil pump while a second oil pump picks up the oil in the bottom of the sump and returns it to the oil tank, common on old British motorcycles and radial airplane engines, also on some race cars in order to allow a shallow sump for more ground clearance when the engine is very low to the ground.
These are called “dry sump” engines. That photo of a Honda CB 750 crankshaft with the power takeoff from the center of the crank was a dry sump engine.
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