I have previously sent samples to Westrac/CAT here in Australia, not sure if they will still do aero engines:
http://www.westrac.com.au/EquipmentM..._Analysis.aspx
Castrol do thier own:
http://www.labcheck.com.au/whatIsLabcheck.asp
also actrol
Wear Check Oil Test Kits - Actrol
Some info on the things you need to know before getting samples done:
https://www.casa.gov.au/standard-pag...s-program-soap