Just before the lockdown I acquired a 20hp Johnson, which ran, but was not pumping water very well. I ordered a water pump impeller and associated gaskets and grommets. Being very hawkish about lubricants and sealants, I would like to know what is best where. The Clymer manual mentions...

The manual says to clean with "lightweight gun oil containing no solvents". Can someone recommend me a good cleaning oil for this type of gun? I have heard bad things about the camo peeling off and yellowing if not done correctly. I'd like to prevent that as much as possible. I mean its a duck...