There IS certainly truth to it if you believe strict test data. If low lube in a fuel shortens the life of one of your injection pumps by 20% or 30% - I doubt you'd ever know the difference.
There has been a lot of testing and it boils down to this.
I'm going to stick to the number used when testing for wear-scars of internal metal parts. This is usually the HFFR test ISO 12156.
Mechancial fuel injection systems with fuel-lubricated injection pumps need a fuel that tests at less than "400,000" to last as designed.
The average high-sulfur diesel was tested at 396,400 with the HFRR test at 60 degrees C.
The average ULSD diesel tests at 666,650 which absolutely WILL make pumps wear prematurely.
Now - ULSD is supposed to have lube additives put in to bring it up to around 500,000.
So, as it stands - if everyone does the job right - and the additives get put in by everyone as they should - then it should be just barely adequate for older rotary pumps. In short - diesel naturally had the lube qualities the old systems need - and now it does not and needs additives.
Personally, I'm not that trusting all of this done properly, i.e. monitored and enforced since it's all still relatively new.
I see putting lube back in the ULSD as a cheap investment. I use two-stroke oil added at a 200 to 1 ratio and it's been tested to bring the wear-scar # down by 160 microns -which is a lot. It adds more lube for less money then most commerical additives - but the two-stroke oil is not 2007 and newer emission's compliant.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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