I want to make a mould of an original car part that would be expensive to replace if I damaged it. Is there any way around this? I've tried using 3m 1080 vinyl wrap in the past on cheaper parts from the same car but that didn't protect the original part at all.

Problem with epoxy tools is they aren't UV stable, and they don't polish to the same high level of gloss that the ester-based tooling systems can. They also are unlikely to take as much heat as a vinyl tool.