Added a 16-oz bottle of 2-cycle oil to a full tank on the SD, and it works for me! After about 50 miles of driving, the car is quieter at idle, and seems to be getting better fuel economy (we'll see). But it is DEFINITELY quieter at idle. I'm still using the old 500ppm fuel, so I only added 16 oz as opposed to the prescribed 1 oz for each gallon.....When I start using the ULSD, I'll add a greater concentration!

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2015 E250 Bluetec Black/designo Sand
2014 GLK250 Bluetec Iridium Silver/Almond
1999 E320 Sedan Bordeaux Red/ Parchment
1999 E270CDI Estate Black Opal/Black
1983 300SD Champagne/Palomino Leather
1982 300SD Silver Blue/ Pacific Blue Leather

I add some but did not notice any differance. However, I had left over 2 stroke oil and it gave me something to do with it. Since is is supposed to reduce the "wear scar" even if it dose nothing noticable it is a good thing.
See post #13 for cart Spicer Lubricity Test. The shorter the blue bar on the chart means less "Wear Scar".
http://www.peachparts.com/shopforum/showthread.php?t=203315&highlight=stroke+oil

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84 300D, 82 Volvo 244Gl Diesel

Placibo affect. Our IP's are lubed by engine oil, so I don't see what would benifit. The injectors certianly don't care, nore does the lift pump.

You are already runing ULSD unless you havn't bought it from the pump in the last 12-18 months.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Well, I don't know if its physically doing anything to the vehicle, (IP or anything else), but it has made it quieter, and seems to be getting better fuel mileage. And I promise, I am not buying ULSD...remember it is not MANDATORY until 2010....Also, bear in mind I'm currently in a place where I could pull up to the Agricultural diesel pump and fill up w/ no questions, (if I wanted to do that)....I just bought the old 500ppm diesel on Sat....

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2015 E250 Bluetec Black/designo Sand
2014 GLK250 Bluetec Iridium Silver/Almond
1999 E320 Sedan Bordeaux Red/ Parchment
1999 E270CDI Estate Black Opal/Black
1983 300SD Champagne/Palomino Leather
1982 300SD Silver Blue/ Pacific Blue Leather

Chances are very likely you are getting ULSD no matter what the pump says. 80%+ of the diesel produced is ULSD.

The parts of the pump that are immersed in diesel fuel can't be lubed by the engine oil. They are also the very parts that raise the fuel pressure all those bar for the injectors and therefore have very close tolerances.

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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png

Broadband: more lies faster.

Well apperantly ULSD doesn't bother them since its been around quite a long time now and is hardly mentioned anymore.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Nothing like a scientific analysis of the situation!!!

If it really was a problem we would be seeing far more pump failure reports.

It is too soon to tell. Also inline fuel injection pumps are the toughest of the type IPs out there. The rotary pumps like the Stynadyne (Roosamaster) pumps will be the most effected, 2nd would be CAV rotary pumps (though these pumps hold up better then the Stynadyne ones), and the toughest of the rotarys Bosch Ep/VA, VE and Vps.
I CA where I am they have to sell the newer fuel and after 6 months drive shaft seal started leaking on my Volvo diesel with a Boach VE rotarys pump. This pump is similar the VW rabbit pump and VW Rabbits and other older vehicles that use the pump had a rash of leaking pumps. There is at least 2 sellers on Ebay that have a business selling the gasket kits to reseal these pumps due to the leaks.
While the newer fuel will shorten the life of the IPs it probably will not be noticed until many hundereds of thousands of miles have passed.
If you have noticed the leaking IP "O" threads you are probably seening the results of the newer diesel fuel.
Luckly the Mercedes inline fuel injeciton pumps do not have many seals to replace on them.
The newer seal kits are supposed to be made with the new diesel fuel inmind.

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84 300D, 82 Volvo 244Gl Diesel

There is some misconception here. The camshaft, rollers,cam followers, the rack, govenor and the lower part of of the plunger are lubricated by the engine oil.
The part of the plunger and barrel assembly that creates the high pressure fuel for the injectors is only lubricated by the Diesel Fuel or good or bad what ever is in the diesel fuel.
There was a chart that had the Walmart brand 2 strok oil as being I believe it was 3rd best at reducing the wear scar on the Plunger and Barrels of the IP. I am not one to follow a chart simply because someone shows up with one but I had the 2 stroke oil left over so I said why not use it. If someone is interested in looking for the chart do a search for 2 stroke or 2 cycle oil and fnd it.

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84 300D, 82 Volvo 244Gl Diesel

When I added 2-cycle oil to my cars my idle actually got slightly louder. That makes sense as any motor oil is pretty low in cetane. To make a diesel engine quieter and still have complete combustion you need to increase the cetane. If your engine gets quieter by adding a low-cetane component like motor oil it means you have more unburned fuel coming out of the tailpipe. The best "additive" to increase cetane and lubricity is by far biodiesel. If that's not available I'd recommend an additive specifically designed for diesel fuel. I think cetane is a bigger concern than lubricity as ULSD is already additized to have "decent" lubricity, though it can be improved further with additives if desired, but I often find the cetane lacking in pure diesel for the altitude where I live. My cars definitely run quieter with additives or biodiesel compared to pure ULSD.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

IIRC BioD has a lower cetane rating than USLD, unless you add cetane boost to the BioD.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

He's confusing cetane with combustion speed, two different things.

Cetane measures ignition delay and you're right that combustion speed is something different. Still, I think what I said is true. A low-cetane, slow-combusting substance like motor oil would probably result in higher emissions. Quieter due to less ignition delay (higher cetane) is good. Quieter due to slow-burning is not always good because if it's too slow it's going out the tailpipe.

No you don't recall correctly. Biodiesel definitely has higher cetane than petro-diesel. Petro-diesel in the US is typically less than 50, often closer to 40 actually. I've seen test results on B20 that showed around 54 cetane and even more for higher blends.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL