作者P&W

使用Mobile的長效機油，在三顆引擎裡面，有兩顆發現了問題，因此他們又把這些引擎的換油里程，從12000英哩降到6000英哩，他們並無法斷定是否是油品問題造成，降低換油里程後，問題就沒有更嚴重了∼

We intended to compare the results of these tests with those from the three taxicabs whose Mobil 1 was changed at our normal interval, every 6,000 miles. Unfortunately, two of the three engines using the 12,000-mile interval developed problems. (We couldn't attribute those problems to the oil.) The third engine fared no worse than the three whose oil had been changed at 6,000-mile intervals.

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我想坊間總是比不上實驗室乾淨，使用的油濾是否統一，本身引擎是翻修過的，畢竟跟新車有差，即使如此這種測試還是跟實驗室沒得比，...