Bill:
I always give it about 30 minutes after a run before I check the
oil level to give everything a chance to drain back down. Checks sooner than that will give you an indication of gross
oil loss but 1/4 of a quart down can easily be attributed to
oil still in the system. 1/4 qt. is 8 oz. or 1 cup of oil. Not a whole heck of a lot when you consider a 7 or 8 qt. total system
DonC