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Concern that Contaminants Linger Longer with Extended Oil Drain Intervals
 
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Question:
Concern that Contaminants Linger Longer with Extended Oil Drain Intervals
I realize these oils are durable and do a good job keeping the engine from sludge. But is it a good idea to keep the contaminants floating around for so many miles?
-- Bob Stenerson, Rindge, NH
Answer:
ExxonMobil does extensive field testing in extremely challenging environments. In the course of this testing we do extensive oil analysis and, at intermediate and at the end of the test, a full engine inspection. During the course of the testing, the oil analysis is closely monitored to watch the exact kind of contaminants you are concerned about. In oils like Mobil 1 where the right chemistry using the correct additives balance is used, acids are neutralized, sludge is dispersed, and high temperature deposits are controlled.  
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