Manufacturers of motor oil for car engines have found through research that motor oil slowly loses lubrication effectiveness after the car is driven for certain distances. On average, the motor oil is only fifty percent as effective after 3,000 miles of driving as it is the first day it is put into the car. For that reason, people should replace their motor oil every 3,000 miles.
Which of the following, if true, would most weaken the conclusion above?
(A) The research indicates that the oil loses effectiveness because it becomes dirty.
(B) The researchers found that there was not a significant difference in the effectiveness of motor oil in cars that reached 3,000 miles quickly versus those that took a long time to reach 3,000 miles.
(C) The researchers found that cars with motor oil at fifty percent effectiveness showed no more signs of damage or wear than those with fresh motor oil.
(D) The researchers were paid by the manufacturers of motor oil, who have a vested interest in selling more motor oil.
(E) Both synthetic and non-synthetic motor oils experience similar losses in motor oil effectiveness after 3,000 miles of driving.OE to follow
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