My sampling company (Blackstone) told me one important thing is to tell them anything out of the ordinary from normal sampling procedures. Like if you took it not as hot or run as long as normal or taken a different way or spot. They will consider this when they give their opinion on the sample.
Someone awhile back here mentioned putting a "t" with petcock on one of the oil lines to take a sample with the engine running...sounds reasonable or just another place to leak/fail....depends on how you view minor complication.
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