Opti-Lube "Boost!" and "XPD" Diesel Fuel Additives
 

Another user on the forum claims using Opti-Lube XPD increased his MPG by 11%:

http://ecomodder.com/forum/showthrea...ive-26910.html

XPD claims to raise cetane by up to 3 points, add lubrication to fuel, remove water and give the fuel anti-gel properties down to -10 F. However, they have another additive to increase cetane higher: "Boost!". It's mostly for raising the cetane rating, in this case up to 7-9 points which is more than other manufacturers I've looked at (Amsoil and Diesel Kleen) claim for their own additives.

Link to Boost on Opti-Lube's site:

Opti-Lube Diesel Fuel Improver | Grease | Oil Fortifier

They have a few other fuel additives for other purposes but I won't talk about them here; what I'm wondering is if anyone else here has tried it and if "Boost!" will increase MPG more than XPD for the higher cetane increase.

Here's a chart rating how well each of Opti-Lube's additives work for what application near the bottom of this newsletter from 2014. (I tried to find something more direct.)

http://opti-lube.com/downloads/newsl...014+Newsletter

Please do tell what you think.

Diesel fuel needs moar lube?

Older engines may need fuel that lubes the injector pump better since they were designed long before the ULSD mandate.
I would just use a little vegetable oil or 2 stroke oil.

Even with newer common rail 5.9 Cummins it seems safe to use a little 2 cycle oil or standard ATF in the fuel occasionally. I wouldn't buy the magic wonder oils with their much higher prices.

I've used Opti-Lube additives for a few hundred miles, overtreating the first tank. I now use them at these rates:

Boost: 1 oz./ 10 gallons (Max rate)
XL: 2 Oz./ 10 gallons (Max rate is 2.5; note this isn't the XPD additive mentioned above. This one's for enhancing fuel lubricity.)

The vehicle does feel like it has slightly more power, the transmission doesn't downshift as much going up hills and the engine's quieter although I'd expect some of the quietness to be attributed to the better oil filtration I now have.