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North UK

It should be fine.

Use LiqyMoly 4T shooter in your tank to soft clean whatever may be inside the lines coming for the tank.

The additives of the wrong kind can leave a bit of an oil residue.

Also bare in mind sometimes engine does *blow by gasses* then it leaves a thin layer of oil (when it turns from hot mist to liquid) in the airbox but its normal.  As long as bike operates normally.

// Meditation doesn't mean you have to sit still....