From 12/03 to 12/06 I owned a Class 6 car car hauler with a Cat C7. I know its not quite comparable, but here's my experience. After the first 2 oil changes, I switched to Rotella Synthetic. I was able to extend the changes at least DOUBLE the mileage of dino oil. Once I even got the AmSoil synthetic and was able to near TRIPLE the mileage. Cost of the AmSoil was a bit much, and it had to ordered. You also had to order extra for top-off, cause of course you cant find it anywhere. As far as running cooler or more MPG, it wasn't really noticeable. But for cost effectiveness and less time down for maintenance, you cant beat synthetic. :rock:
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If you always do what you've always done, then you will always have what you've already gotten.
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