Best diesel system cleaner?

[MichaelXJ]

Hi all, wondering what people's experiences are with diesel cleaners? I am picking up a 2002 Mercedes s class with 220k miles on it. Yes I know its stupid but it's stupid cheap with 12 months MOT. One thing the owner said is it has the occasional misfire, now I thought the easiest thing to do would be to give the diesel system a clean as I suspect its been run on cheap fuel and it'll of started to sludge up somewhat and the spray pattern of the injectors won't be what they once were. He reports back decent MPG figures 40+ on a run so I think it's got some life left in it. Wondering what people recommend, I've seen wynns xtreme system cleaner, I've seen a mannol diesel ester fuel additive etc and wondering which would be best? A mixture of both or don't mix. Any advice would be appreciated! Thanks in advance.

[MichaelXJ]

Should probably say before people ask. Stupid cheap is £370.

[MichaelXJ]

Not a clue. I'll see what it's all like when I pick it up I guess. A good run on the motorway will definitely happen, sounds like an Italian tune up will help but i thought I'd through some extra cleaner in there to help it out.

[MichaelXJ]

Robotron70 said:

I swear by this stuff, you can buy it on Amazon or directly -

https://www.hydra-int.com/maximus-diesel-power-boo...

And I don’t work for them

I've ordered 500ml of it which should be good for a few tanks and only £11. Can't do any harm as you said and as it's on 220k miles I suspect it'll do it some genuine good