Use of Diesel Purge While Under Load? (Effectiveness, MPG?) - PeachParts Mercedes-Benz Forum

Shawn D. · #1 04-17-2007, 09:45 AM

Y'all,

I've picked up two 500ml cans of Lubro-Moly Diesel Purge and am planning to purge soon. From all the posts I've read here about the process, it looks as if everyone does this at idle (or running the engine at various speeds) and not under load.

Has anyone done it while under load (i.e. actually driven the car)? If so, did it seem to make any difference in its effectiveness? How quickly was it consumed (i.e. what was the effective MPG relative to the car's normal MPG)?

My point in asking the MPG question is to determine whether the 1L of Diesel Purge will allow me to make at least one jaunt around the neighborhood and get back home before the reservoir runs dry and the IP sucks air. My 300td normally gets 27 MPG, so will the 1L (0.25 gal.) of Diesel Purge allow me to make a two-mile loop around the neighborhood with a safe margin?

Thanks in advance,
Shawn

vstech · #2 04-17-2007, 09:56 AM

Dieselgiant's website states just this, it will be enough to drive around.
check out his writeup.
John

bodyart27 · #3 04-17-2007, 10:24 AM

On my last spin-on fuel filter change I refilled it with diesel purge. I puttered around the block (no hard turbo boost) to speed up the process. Can't tell you how long it took to go through (plus diesel fuel was probably instantly being mixed in to the fuel filter).

I'm not sure what the effect would be of getting on boost with just pure diesel purge, however, I wouldn't be surprised if the engine could handle it based on the crazy types of fuel this care can use.

neptune · #4 04-17-2007, 12:08 PM

1L of diesel purge should get you several miles of driving easily.
I recently ran one 500mL can through my sister's 240D, running it at idle then higher speeds once warmed up. It took at least 20 minutes to run the single can through, probably more. I had time to nearly finish changing the oil on another car while it ran through.
I would have driven it around if I would have had enough hose and a plastic container for the diesel purge. I had a glass jar and not enough hose to securely mount it in the engine bay, so I didn't feel comfortable driving it.
You should be fine.

pawoSD · #5 04-17-2007, 12:41 PM

Heck I have driven around on nearly pure Marvel Mystery Oil!

(and diesel purge too)

lonewolftek · #6 04-17-2007, 01:30 PM

I've driven as far as 4 miles, on two cans of Diesel Purge.

The first time I did it, when the turbo kicked in I saw a lot of smoke coming out the tailpipe and started to worry. Got down off boost, puttered home, hooked it back up to the main tank, have had zero problems since then.

Cervan · #7 04-17-2007, 07:48 PM

i would use it hard as possible. meaning dont floor it in neutral go to a stoplight and put the petal to the floor if you have a long incline floor your car the whole way make sure you dont do it on the way down though... basically when your engine is under load it will clean up best.

2.5Turbo · #8 04-17-2007, 09:41 PM

That's what I did when I ran some DP through mine. Putting the engine under load increases the combustion temps and in theory should increase the effectiveness of the DP. I did my DP runs on this big hill on a side street by my house. I just coasted down and floored it to the top many times until the DP was near gone, pulling over every couple runs to check the level. Be sure your container is secured to something on the inside of the engine compartment, and that you have the tools necessary to hook your fuel lines back up if you accidentally run it dry.

Shawn D. · #9 04-17-2007, 10:47 PM

Thanks again for the inputs! I have a few moderate hills I can traverse, and I will definitely secure the container and carry tools with me (I'd already figured that much!).

toomany MBZ · #10 04-17-2007, 11:40 PM

[quote=Shawn D.;1482314]Y'all,

From all the posts I've read here about the process, it looks as if everyone does this at idle (or running the engine at various speeds) and not under load.
IIUC, there is no difference between various rpm, the way I do it, vs driving around, under load. The only problem would be you cannot tell if you're going to run dry. The engine does not know if the car is moving.

300SD81 · #11 04-17-2007, 11:57 PM

1 can lasted me around 2 miles, so mileage is definitely not good on the stuff..

bustedbenz · #12 04-18-2007, 07:52 PM

Did you return it to your purge container? Or just take off the input line and let it return to the tank? Because it'd definitely go that fast if it was pumping it back to your fuel tank.

diametricalbenz · #13 04-18-2007, 08:06 PM

Quote:

Originally Posted by 300SD81

1 can lasted me around 2 miles, so mileage is definitely not good on the stuff..

I made the mistake of doing this with my 76 300D. I got 1.5 miles when the car died on a long freeway onramp which has a bend in it. That car is a PITA to reprime and had to have it towed since I ran the battery dead trying to get it going.

winmutt · #14 04-18-2007, 08:21 PM

I like the idea of letting the car sit up overnight. I do an ITU as I live on a big hill. ITU every day!

Shawn D. · #15 04-19-2007, 09:33 AM

Thanks again for the inputs. I understand that I need to plumb in the Diesel Purge as its own little fuel system, but thanks for the reminder! I have two cans to use and figure I'll have enough margin to do a 2.5-mile loop.