3.7 quarts is never enough. I always end up topping off with the rest of that fourth quart.
Remember to double check the oil level the next day, too, just to be sure.
Also, if you have it WAY too full (which seems unlikely), you can carefully loosen the drain plug and drain a little out. Just don't pull the plug all the way away from the threads at the last moment and you can just let a little squeeze past and then quickly rethread it in there! Takes a little finesse but it isn't too bad.
--Wag--