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Originally Posted by oldnavy
One of the things about the use of synthetic oil is the extended drain interval. Most diesel cars using a synthetic oil for diesels (has additive package for soot not found in regular synthetic oil) can easly go 10 to 20 thousand miles on an oil change.
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I too like the extended drain intereval with the synthetic. I run Rotella T synthetic, at $13.00/ gallon, and I change it at 5K miles. Now, oldnavy, I have to disagree with attempting to go more than 8K with a 617 engine. I did that one time. I had the oil tested after that 8K run and, although the additive package was fine, the soot levels were definitely elevated. Since soot is an abrasive, it would be foolish to attempt to go 10K or more with any oil in a 617. The 616 is similar.
Since I feel the need to change every 5K due to soot levels, it does not make a whole lot of sense to purchase the better Group IV synthetics.