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I am going to agree to disagree here.....many who are "stock" just drive the truck and have plenty of dilution , its not a requirement to let your truck finish the regen process. Those of us who know better may have similar results as you but I am sure there are plenty of people who take relatively good care of their truck and have high dilution rates. I never started sampling until i was deleted so i cant say, but I do know that I have had less than half a percent of fuel if any.
Lots will say that Bio will make fuel dilution worse, in stock form this may be so but i run B-20 religiously and have been for 10,000+ miles with no ill results and my UOA's are great! I do think there are many factors that come into play here so each truck will vary.
The new generation of diesels are pretty much light years appart technology wise from the old generation of diesels. There are a great many benefits that come with electronic fuel injection and variable geometry turbos, but they also come with a requirement for a higher level of maintenance.
I don't specifically run bio, but I know I've had a number of loads of bio blends while doing some trips between TX and CT and they have not made any discernable difference in the UOAs, so I don't think bio is an issue fuel dilution wise. So far the only thing I've seen give notable fuel dilution is interrupted regens.
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