Why is the rum gone?
Join Date: May 2012
Location: United Kingdom
County: Greater Manchester
I'd say that looks Ok.
The filter material looks quite clean (although the photos don't show much inside the folds)
If that was mine I would probably leave it in and keep the new filter for next time.
(if it's only getting that dirty in 9k then another 9k will be ok)
I wouldn't worry too much, the dealer tried it on last time with the pollen filter and got caught out, I would be really surprised if they try it on again, especially with something as common as the air filter. (particularly when they know they have to give you the old ones back!)