It sounds like you're overfilling the crankcase enough to let the rods whip air into the oil. Foamy oil doesn't pressurize like straight liquid. That extra quart will find its way out of any little crevice, or it will get pulled through the road draft tube. Once the level drops enough to keep the rods from whipping it up, the leakage and/or oil burning stops. I'd suggest doing a 5 qt. oil change, not 6, and marking the dipstick accordingly. The filter canister won't hold a full quart- - - -the metering orfice in the standpipe will let almost half the oil in the filter canister gravity drain back into the oil pan when the engine stops.
jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!