I have 2 documents that refer to oil change intervals. One is the CAT RV recommendations LEKT4302 0r LEHT92886-06. Mine is dated 6-07 and applies to 3116,3126,3126B,3126E,C7. I believe you posted a more current copy of this document. I also have the operation manual for C7 "ON HIGHWAY" engine KAL1-UP. This is manual # SEBU7766-03 and is dated July 2003. The RV recommendations makes NO MENTION of hours. PERIOD. It does say that a KAL with a shallow pan (19 qt) has a 1 year /11,00o mile interval. There is a note that the capacity was changed due to side mounted breather. The on highway engine manual DOES state that a PM level 1 including oil and filter is every 11,000 miles, 1100 gallons or 250 hours or 6 months. There is also mention in this manual that the 11,000 miles is based 1100 gallons @ 10 mpg. Makes one wonder what kind of on highway vehicle with a C7 gets 10 mpg. So using their logic my statement of 7500 miles is perhaps too conservative. 7.5 MPG X 1100 gallons equals 8250 miles. There is nothing wrong with changing the oil every 6000 miles. But one should do this because you think it is a better practice not because you think that is Cat's recommendation. I doubt any of us would have a problem with any of the above intervals. Today's oils have a much improved additive package. Many newer diesels have a 15,000 mile interval and OTR trucks go 35,000 or more. Of course they do not have HEUI pumps.
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Moisheh
2008 Dynasty 42' Diamond IV
1988 Bluebird PT38
2009 Silverado Toad
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