it is some times very hard to tell the diffence between automotive and aviation hardware
I'm not an engineer and almost certainly couldn't tell the difference. I can only really go by what the guys at Diamond are telling me and I'm happy enough that THEY can tell the difference.
Diamond also found that the oil pump housing had been damaged and that "someone had gone mad with some sealant" to stop it leaking. (Remember that the guys at Elstree replaced the engine and nobody else has worked on the aircraft since).
So pretty much anything is possible . . .