Originally Posted By: morris
a real test has to be a "double blind" test. i think what that means is ALL the people doing the test dont know what if they are using oil "A" or "B". could i be right?
As opposed to an unreal test? Double blind testing is frequently done with test medications: both the patient and the person administering the drug don't know if the pill is the real drug or a placebo. Hence, 'double blind'.
If you were testing an engine or an additive or some mechanical device, you might be better off keeping both eyes open. The only possible need for a double blind test would be a situation in which the test operator could materially influence the results, or if you planned to simply asked the operator for his opinion ("yeah, it ran great!"). If you can measure the results more objectively (more mpg per the ECU, greater cylinder pressure per the pressure gauge, less fuel used based on pump records) there is little need for a double blind test.