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Old 07-29-2003, 10:15 PM
Duke2.6 Duke2.6 is offline
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Join Date: Mar 2003
Location: Southern California
Posts: 2,010
C means compression igntion, I is the current spec, and I believe the -4 means four-stroke, which covers most currently manufactured automotive/truck diesels.

S means spark ignition and L is the current spec level.

You can read more about motor and gear oil specs at:

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