A good read on oil

yellow rose said

You should run the best oil you can afford, and then some. The cam isn't the only thing that needs dry film lubrication.

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I thought I already replied to you here. I must have missed the post button.
A good oil with anti-wear additive is important, but since the OP is in The Netherlands, he has good choices for European oils. If the Valvoline is hard to find, a high SAPS oil, like a BMW LL-01 spec oil will do very well, and is likely widely available. A 10W-30 might not be easy to find, but 5W-30 & 0W-30 should be, and will do well.