RE: Afterrun oil
Ok this was a little write-up i found, not by me...
NEVER, ever, use WD40! WD40 is not a good lubricant despite the claims on the label. Legend has it that the WD stands for Water Displacer - which is one of the functions of WD40 when used to coat tools for rust prevention. WD40 is much too thin to do any good as a general lubricant and will quickly collect dirt and dry up. It is also quite flammable and a pretty good solvent - there is no telling what will be affected by this.
So i just dont want to see a newbie coming in here and not reading thru the posts and getting the impression its a lube, and alot of this is from experience in a mechanical backround working with small engines.