Is my engine likely damaged?

[ARH]

Its funny that the original post only asked if there might be damage. Its only 13K miles so unless it ran out of oil then it's safe to say no. Where did this sludge filled nightmare come from anyway. You'll scare the poor guy into paying a fortune for new engine parts. 

As I said before, just change the oil and filter and try not to forget next time. No drama.

Nothing funny about it. You mention oil and you get the same mix as if you mentioned religion or politics.

Or tyres 

[Andre]

Its funny that the original post only asked if there might be damage. Its only 13K miles so unless it ran out of oil then it's safe to say no. Where did this sludge filled nightmare come from anyway. You'll scare the poor guy into paying a fortune for new engine parts. 

As I said before, just change the oil and filter and try not to forget next time. No drama.

Nothing funny about it. You mention oil and you get the same mix as if you mentioned religion or politics.

Or tyres 

[Mick_J]

If the engine has suffered any damage then changing the oil trice and or mixing it with diesel (or any other wonder cleaner) is not going to make any difference the damage has already happened.  However if the bike is not smoking or pumping oil into the airbox and is running fine just change the oil and filter and make sure you remember next time, I personally think you should be okay, significant damage to the barrels would have had you topping up the oil long before now.