The biggest issue with fuel in the U.S. is the absence of lubricity, which is lost during the desulfurization process of ULSD. Because it travels within bulk pipelines and it's intended use is unknown, (aviation fuel, #2 diesel, etc.), no additives are introduced by the refiners. Only after it reaches the terminals and is being delivered to the dealers, etc. are additive packages introduced. BIG NASTY has on numerous occasions related how well that works. The fuel itself is dirty and barely meets ASTM specs in comparison to what is available in Europe according to OZYMANDIAS, one of our contributors in Switzerland.
Prior to 2007, the engines weren't designed to run on 15PPM Sulphur Diesel (ULSD), and it was common knowledge that something probably needed to be added to boast the lubricity on the ULSD to be used in these older engines. Since 2005, ASTM Standards (ASTM D-275) were established recommending (not mandating) 520 microns as the maximum allowable scar test standard before engine damage and/or premature failure resulted. Since this standard is not always mandated it becomes difficult to prove. Now comes the Engine Manufacturers Association requiring a maximum standard of 460 microns. So how is this obtained? Yep, with additives and /or a smidgen of bio-fuel if you suspect the fuel distributor occasionally drops the ball. Consequently, some of us who are OCD continue to put a squirt of snake oil or some 2-cycle in the tank, while oil companies maintain they meet ASTM standards and engine manufacturers want something better.
- Ed
I am probably a bit OCD about the issue because I really do not want to accidentally grab the wrong hose at the gas station and accidentally pump the wrong fuel into my tank. Have actually had nightmares that I made that mistake and likewise fears that I will accidentally get DEF in the fuel.
I actually think my OCD has served me well.
But I don't put additives in every tank because I believe you can overdo it.
I treat every other tank or every third tank. Some instructions say to double the dose in winter. I would never do that even if I lived in a colder climate.
I was sold on optilube because it is so slick and is recommended by almost everyone who tests additives. I spilled some on the pavement accidentally and almost slipped and fell down because it was so slick. However, it is the properties that it has after being put in the fuel that matter.... Not it's individual properties.
Then I saved an 8 ounce bottle instead of discarding so I could use it to measure optilube out of a larger bottle. I noticed the dried optilube in the bottle was very gummy.
That was when I decided not to use the same additive, but to switch between, power service, stanadyne, & optilube. And at that time, I decided an occasional dose of added lubricity/added biocide is adequate.
Some will have the luck of driving 300,000 to 500,000 miles and never get a bad/contaminated/mistreated tank of fuel.
But none of us really know what is actually coming out of the pump.
Purely anecdotal and my own thoughts.
Edit; I've decided to add penray POW-R 365 in to my fuel treatment rotation of every other or every third tank.