Consumption test guidelines for warranty usually state that the dealer must be the one doing the oil changes, top offs and checks. It throws everything totally out of wack when the customer is possibly changing the oil level between when they start the test and conclude it is consuming oil. Also every engine takes a slightly different amount of oil to reach a certain point on the dipstick so they might need to know exactly how much oil was put in in order to determine how much it's using down the line.
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