I use BTA in kamloops
http://www.btarcm.com/
only done a few samples, but they seem conscientious, and have personally called me to discuss the results. I think owner Ed lalonde may be an AME, the name sure sounds familiar....but in any case they do a ton of work for the mines & gov. in the area....use the usual prepaid kits etc.
Jim, what kind of oil? I use Exxon Elite 20-50w, and recently sent a clean stock sample, so they should have that on hand for reference now.