I don't know the difference between a "normal" HDEO and a NG oil, nor have I ever run a NG powered engine to see a UOA from one. I can tell you that a bypass oil filter sure does remove a lot of soot from a diesel engine's oil, regardless of the type.
Chevron has been saying the same thing for at least a couple years, maybe more. Only until now, they were referring to diesels. I lose track of time too easily, but probably a few years ago, I heard a Chevron rep on a radio interview saying that bypass filtration was unnecessary. It's true that many fleets run oil and standard filters for a crazy number of miles with success. The thing is, they may keep those trucks for 400k-600k miles and then say goodbye to them.
There are many owner/operators using Gulf Coast bypass filters and never touching the drain plug...just changing filters and topping off the oil. Others use smaller bypass filters and get a few hundred thousand miles between changes. And then there are those that run the small bypass filters just to remove more soot but don't really get into the oci extension.
In the mid and late 2000s, I used a little FS-2500 bypass filter on my trucks. It most certainly removed much more soot and the oil retained much higher TBN reserve that allowed me to extend the oci with confidence and peace of mind.
