Quote:
quote:Originally posted by kozzy45
The manual says to follow Schedule B, which is 7000 miles.
The cummings website says every 7000 miles,
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Sounds like a no brainer to me. My answer to your question has to be 7,000 miles. This subject gets kicked around on most every forum and I always wonder why anyone would want to differentiate from the manufacturers recommendations. They built the engine and I consider them the most knowledgable, even experts if you will, and afterall it is their warranty. I can understand your dealer is saying 3700 as he gets to make twice the bucks.
In my case, Chevy says 10,000 miles and I change mine by the book.