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Old 05-06-2002, 11:52 AM
tcane tcane is offline
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Join Date: Jul 2001
Location: San Antone
Posts: 408
The only way to know for sure if your oil can handle extended drain intervals is to send a sample to a lab for analysis. The lab will provide a break-down of the oil's condition (additives, chemical composition, etc.) and what the oil contains (contaminates, metals, fluids, etc.). A search of the forum or web using search term "oil analysis" will locate several labs that can analyze your oil.

Good Luck!
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