And yes,you can use only two quarts of oil to flush out any "remaining" old oil in the engine because the minimum amount of oil our engine should ever run low is 1 1/4.
Please read again & focus on what i'm explaining.
You can run 2 qts. of oil in YOUR engine, I think I'll pass.
I've waited until it was half a qt. low & added half a qt. of Seafoam. Then driven it for 5-10 miles. But there is NO WAY I'd even let it idle with only two qts. in the crankcase...good luck!