Just curious what the current thoughts are regarding adding anything to our fuel to improve lubrication of the pump, etc. Any real need to do this? Substitutes such as ATF in place of expensive over the counter additives? Any research behind why we might want to do this that is science based versus opinion? Do tell!

search on "lubricity study"

I run 1oz 2-stroke/gallon because it is necessary to lube the $1,000 VP44 injection pump in my 24V Cummins and may help the SD. Never any problems from the SD so additives may be unnecessary. Fuel used to be almost greasy. Not so any more.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

http://http://www.powerservice.com/dfs/

I use that, 4 oz every fill up.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

As long as your Fuel Injection Pump gets clean Diesel Fuel it is going to out last your Engine.
Additives do more than just lube the Fuel Injection Pump so they have other good things to them.

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84 300D, 82 Volvo 244Gl Diesel

It's hard to tell nowadays (in some areas, at least) who has good fuel and who has stuff that'll make your engine smoke. +1 with jay_bob, regardless of where I get mine, 4 oz of PS Diesel in the tank. Works like a charm. Sure, it can be up to $10/bottle, but I think it's worth it.

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- 1979 W123 240D 4-speed, 390k miles

In both my SD and SDL...

(Just wanted to say that I use this primarily for Cetane boost, not lubrication...)

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Mine: 1987 MB 420 SEL - 62K (Dec 2019)
Mine:1991 MB 350SDL - 244K (Aug 2011)- Totalled 9/14/2016
Mine:1981 MB 300SD - 326K mi (July 1997)-sold
Wife's: 2008 MB C300 Sport - 92K mi (April 2009)

What will really save your VP44 is an aftermarket lift pump and a pressure guage so you know if the VP is starved for fuel. That's what kills them, along with "magic black boxes".

You don't need to buy any expensive additives to take care of this. Just keep a quart of cheap oil in the car and pour about 1/4 to 1/3 of a quart in the tank before every fill up. This will be more than adequate.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

Annoy a Liberal, Read the Constitution

There is supposed to be enough lube in the diesel fuel, as required by federal standards. However the debate seems to be wether this is really enough. Pumps in my area now have at least 5% bio diesel in them, and this is really the best lube. I think I posted a link to the lubrictity study somewhere here. Search and see if you can find it, it came from another forum, just do not remember which one.

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1977 240D turbo

X2 One study I read came to the conclusion that just 3% biodiesel was the best lubricant.

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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss

I've used this for a few years. Slightly better fuel economy, and runs a bit smoother.

alterradieselmaxx dot com

Probably just biofuel, hehe.

When I worked for the second largest parts chain in the US, I came across MANY product samples. I have many gallons of this stuff...

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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI

Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D