Just to report on the subject. In my last post I wrote that will let the dealer to put what ever he recommends until I notice negative behavior. So, the clutch slip happened a few times on hard acceleration. At first I thought it was wheel spin but than I realized that the clutch was slipping. Changed the oil with semi-synthetic Motorex Formula 4T 15W/50. Immediate difference, and still present after 1000Km. Better acceleration, better engine braking. Harder shifting though.
On next service for sure I will not easily indulge the dealer.
I can see by my watch, without taking my hand from the left grip of the cycle, that it is eight-thirty in the morning. The wind, even at sixty miles an hour, is warm and humid. When it's this hot and muggy at eight-thirty, I'm wondering what it's going to be like in the afternoon. - Robert M. Pirsig