most of V8 engines need 10+ quarts

I've owned and driven V8 engine powered vehicles since the 1970's and have never owned one that used more than 7 qts of oil for an oil change. Most use 5 qts plus a filter. That is why oil is sold in 5 qt jugs. That's all that most vehicles need. Of course my vehicles are all model year 2015 or earlier.

I checked specs with different manufacturers and find that the V8 engines that need 10 qts of motor oil are the heavier duty trucks typically with a diesel engine. Checking specs shows that most gasoline V8s require 6 qts, some require 7-8 quarts, and the larger diesel trucks require 10 qts, sometimes up to 11 qts depending on the engine.

10 qts of motor oil takes up a lot of space and that is at a premium in most engine compartments. The oil pan would need to be deep and trucks are the only vehicles that have that much room between the engine block and the crossmembers/differentials.