From the Danish GS-team:
Vorsicht mit synthetic oil, it can do horrifying things to you and your bike.
It will not only leak out of your engine faster than you can put it in, but it will also cause your oil filter to clog and implode, putting debris and dirt into your lubrication system.
It also will make every part of your bike permanently slippery because of its linear molecular chain dispersion action.
Then it will leak onto your kickstand causing it to retract, and your bike will fall over. It will also splatter onto your seat causing your girlfriend to fall off in front of a crowd.
Synthetic oil coats your oil sight window with a whitish pro–emulsification additive that is both non–removable and highly corrosive.
Synthetic oil will wear out your tires and make your battery leak. It will give you a desperate need to urinate after you put on your helmet and then jam your zippers shut.
Synthetic oil chemically weakens intake and exhaust valves and causes the clearances to change every few kilometers.
it will cause both handlebar grips to slip off at the same time so you smash into your windscreen with your nose, usually when riding past groups of attractive young women.
It dries out your wet clutch and wets your dryclutch. It makes your clutch slave cylinder seal fail while putting an angry wasp in your helmet.
Furthermore synthetic oil hides your 13mm socket and puts superglue on your earplugs. Synthetic oil will scratch your goggles and make your gloves shrink two sizes the night before GS Fünf–Kampf. Synthetic oil will make you grow a tail. Synthetic oil will write long crazy e–mails to everybody in the team and then sign your name at the bottom!
Vorsicht!
Schultz