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Discussion Starter · #1 ·
API did a study in which they took 1800 samples from bulk oil of various sources and, on average, 1 in 5 did not meet the API classification they were stated for. Just one more thing we all need to worry about, especially those that do not do their own oil changes.

http://www.hardworkingtrucks.com/testin ... e2538bb77f
 
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