As one who has 11 or 12 liters of oil in my engine, I get it changed each Spring, and if I have put more miles than usual on it during the Summer, I get it changed before Winter storage. As Stan says, it's the age and acidity of the oil you need to be concerned with. Two filters need to be changed each time, also.
And an oil change for my car ain't cheap...
And Stan, you forgot me..."I now know of 3 guys who are dry-sumped-- you, Danny, and me. I'll never go back."
Add in my compatriot David Stroud, and we have at least five members of the Dry Sump Society.