Thanks for posting your results. It's good to see what's happening to the oil over time. Now I'm curious as to whether Amsoil is available in Colombia, will have to check with some of our local lubricant distributors I suppose. The Honda XL200 has been running Honda brand (used to be Mobil) Semi-Synthetic, changed out ever 2,000 kilometers. The XL engine has no filter so I'm not really comfortable running it more between changes. My wife's Biz100 has been changed regularly every six months or so since brand new. She never makes 2,000 km between changes as the run to work and back is so short so it gets changed on a calendar basis instead of hours/kilometers. It always comes out looking fairly good, that engine will probably last looong past when she's ready to quit riding the little scooter. Anyway, once I pick up the RE I'll run the engine in and then switch to a synthetic - depending what's available down here. The other day I came across some Motul 4T 7100 20W50 at a local shop. It's the first full synthetic bike oil I've come across here. Quite steep in price at twice the cost of the Honda brand I've been running - but still cheap insurance in keeping a motor going over the long haul.
Again, thanks for putting this info up for us.