I am definately not a believer in snake oil cures but the Lube Moly Diesel Purge product is downright amazing. I ran one and a half cans through injection pump idling with supply and return lines varying the rpm.

The difference is so dramatic, smoother increase in rpm, smooth idle and no smoke at any rpm. What's crazy is my car did not feel like it really needed it, I was not chasing any particular issue. Again I am not advertising the product but this is an awesome chemical to use as part of your maintenance register.

Used it on my 95 E300/OM606.

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1995 E300 (W124)
1999 ML430 (w163)
2011 GL350 (x164)
2016 Sprinter 144" 4X4 lowtop (906)
2004 E500 (W211) 4matic Wagon (Gold)
2004 E500 (W211) 4matic Wagon Avantgarde (silver)

It will hopefully dissolve some deposits. If a component is physically worn of course it cannot fix it. In your case I suspect it cleaned up the injectors somewhat.

What has been reported before is an only short term improvement in some cases. Hopefully yours will be longer term.

What overall millage does your car have?

Injectors removed for testing at certain millage intervals is a factory requested maintenance . I think every 100k is the original factory manual recommendation. Most sets of injectors at that millage initially would probably still test good.

Personally if the fuel is clean and the secondary fuel filter changed at reasonable intervals I think they can go much longer before a check is even warranted.

Smooth even idle, decent acceleration and fuel milage still good I leave mine alone. This to me indicates that even if the injectors have accumulated a little wear they are still good enough.

They have to wear with accumulated use to some extent and the internal spring that regulates opening pressure like all springs will age with time and use.

I think the product is a reasonable one as long as what it is capable of doing is well understood. It is limited to dissolving some forms of buildup because it is a solvent.

I am at pretty much of a loss of why the improvement sometimes only lasts a relatively short time. Say a week or two. At the same time if that occurs it is a pretty solid indication that the injectors need work. So it is a product that has a reasonable use even if the problem comes back.

Just my two cents worth at best. I have four good running older 616 and 617 engines. Since I never got any service records with any of those cars. I have no ideal if the injectors where ever even pulled and checked since they were new.

Well one had a recent Mercedes replacement engine installed not that many miles before purchase So I will assume the injectors came with it and were either new or rebuilt. .

If I ever win the lottery it's going to be:

1) Take my kids to Disneyland
2) Get all new teeth
3) Buy enough Diesel Purge so I can run full tanks of it for a year

Side note: I did one full bottle of it and the results were amazing. Then I ran a second bottle and it immediately made it worse. So don't be tempted, just roll with the good vibes you've got now.

-Rog