CAAD
The Trent is not a US engine. It is from the UK and is therefore certicated by EASA. So the FAA process you quoted does not strictly speaking apply.
YES, the engine was originally certified by the EASA, but, it was subsequently certified by the US FAA. As to the oil, this presentation may give you better insight into EASA/FAA relationships.
http://isoclean.net/uploads/GE_turbi..._pres_STLE.pdf