Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
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badton: I mean no disrespect by my post, not picking on you personally, just the common idea that curculates that the HPOP oil is isolated from the rest of the crankcase oil, as it is not. I do not know the exact capacity of the HPOP and injector system, but over all, from what I have read here on PS. org, I don't think it's worth the effort, nor do I know the exact time it will take to TOTALLY replace the HPOP oil with fresh stuff after an oil change. However, common sense, I'd bet it's circulated and mixed up enough, for all practical perpouses, after a 10 mile drive at 30 MPH. That's 2 trips taking the kids to school for me...
I do know that after a fresh oil change, and the same 10 mile trip as an example, the new oil looks just as black as the oil I drained out 10 miles earlier, when checked on the dip stick.
I would be interested in the temp ranges for the standard 5-40 and the lower visc. oil one might use in colder locations, and how much they overlap. I have never changed for the winter months, as I only put about 13-15K a year on each truck, so a winter oil change might last untill warmer months, when the lighter oil might not be so good for the engine.
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