The content of that Lycoming document is a crack up. If I didn't know that many of our US brothers and sisters don't 'do irony' too well, I'd guess Lycoming had run a competition to see who could:
(1) use as many words as possible to state: "Make sure you set mixture to full rich before taking off (unless DA requires some leaning) and make sure you maintain your spark plugs properly", and
(2) squeeze in as much unsupported codswallop as possible.
Go to 1,800 RPM for 15 to 20 seconds to "ensure the engine gets properly scavenged of lead just before shut down." I'm hoping that's the product of comic genius rather than abject ignorance.
