Yes, it can invalidate your warranty. I did some research not long ago on this very thing. Over 88 insurance companies were underwritten by just 28 underwriters. All 28 used wording like they "may" use non original parts or secondhand parts. I suggest everyone reads the terms and conditions of their policies carefully. It is very concerning, and something I have banging the drum about for a long time. These non manufacturer parts do not perform as the original manufacturer intended, as they may be cheaper copies. Some items like headlamps may be from the original manufacturer but aren't branded. These will perform as they should, but may make it apparent the car has been involved in a incident because the brand mark are missing. Block exemption covers certain aspects of repair on your vehicle, but a policy of insurance is about "indemnity" putting you back to the position you were in prior to making a claim. I can't see how an insurer can do this when fitting non-genuine parts.