Thanks all for taking the time to respond!
Part of the reason I was asking was because the flight manual doesn't offer much information about the topic - keen to find out more about how the system works - so thanks for the feedback
Great advice about the warranty, luckily I don't have to deal with that side of things - but since I'm meant to turn up and fly I'd like to know it's safe (particularly as I'd have other people on board). Seriously wondering whether aircraft utilisation is taking priority over safety...
Have just been advised that the oil filter screen has been cleaned, apparently it didn't have engine metal but had carbon from running high cylinder head temps....