Quote:
Originally Posted by ForcedInduction
Switch it, no need to blend (Never blend oil yourself).
It will increase your MPG slightly, the engine will last even longer, starting will be easier (especially in the winter) and you can easily go 5-8k miles between changes if you use a real full synthetic (Not the fake Rotealla "synthetic"). The oil leak thing is a myth.
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You can go 5K between changes with Rotella synthetic on a 617. Oil analysis shows the oil to be just about at the 1% soot point at this interval and all other parameters are still within acceptable ranges. If you want to go 8K, I'd go with a group IV synthetic. The soot loading will be considerably higher at 8K.