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Using 10PPM Diesel - 300GD

Heinie

G-Wagen Club SA
Joined
May 20, 2013
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Florida Park, Gauteng
#1
Good day you Good People...

I am sure this was some sort of a discussion point in the past.
Of late I have come across more and more filling stations supplying only 10PPM diesel other than SASOL.
In some instances they would also discount 10PPM at better prices than 50PPM at other filling stations.
I am considering to fill up the 300GD with 10PPM in future.
Would this cause any side effects on the motor?

Your comments experience please.

Cheers

Heinie
 

JJVDMZN

G-Wagen Club SA
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Hillcrest
#2
Heinie, what I have heard it that the Sulphur (that's the 500, 50 & 10 Parts Per million Sulphur) in the diesel helps with the lubrication of the diesel pump. I would investigate before I change to 10 or even 50 PPM, I have had forklift engine's diesel pumps pack up because of not enough lubrication in the diesel fuel

JJ
 

Andrew

G-Wagen Club SA
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Oct 8, 2008
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#5
I believe that modern CR injected engines have a greater critical lubricity requirement than older systems, because of greater temperatures, higher pressures and tighter engineering tolerances between metals. Research Bosch CP3 pump failures on the net - quite a lot of highly technical stuff about it - which led to greater attention to lubricity - and subsequently improved low sulphur fuels such that today you can use it in any engine.

Personally I am more worried by shysters mixing parrafin into diesel than ULS diesel. When in doubt I chuck in 1% 2 stroke / bio-diesel /cooking oil.

JJ's observations will probably co-incide with the era of the Bosch pump failures. I believe it has improved.
 
Last edited:
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Oct 8, 2008
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PRETORIA, South Africa. (MonumentPark)
#6
Good Day All,

The main (only?) thing I dislike about the 300 GD is the permanent layer of soot all over, and also in the oil.
Hence, when the cleaner 50ppm became available, I moved to that, and again to 10. I believe that there was less black smoke, and less soot in the engine bay, and also the oil seemed (marginally?) to blacken slower.
With time ( a few years) I noticed diesel leakage, and found the injector pump permanently wet.
Then I heard from an electrician that it was due to the "clean"diesel that influenced the seals. Apparently it "dried out" and shrinked the seals somehow.
Nobody, even my mechanic friends bought this.
I changed back to 500ppm, and soon the leaking lessened.
The leakage has since stopped, injector pump remains dry, and made my peace with the blackness.

It worked for me. I now make sure to regularly fill up with 500, but a tank or two cleaner in between seems to not make a difference.

G-Roetnis
 

Pete460332

Staff member
G-Wagen Club SA
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Cape Town
#7
10ppm won't change the soot, the in-line ip pump in the 300GD does not rely on fuel for lubrication like the new ip pumps , it uses engine oil . So lub is no issue.
 

Heinie

G-Wagen Club SA
Joined
May 20, 2013
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Location
Florida Park, Gauteng
#8
Hi Guys -

Thank you very much for the valuable feedback. To me as a non Engineer, unlike most of you this is clear as MUD to me.
One thing I must admit that is clear - one should rather stay with diesel relevant to the G you are driving.
I will keep to 500ppm on the 300gd as long it is still available but also spoil it with a tank of 50ppm from time to time.
The 300cdi Prof will get a similar switch/treatment from 50ppm to 10ppm once in a while.

The forum is still the best way in obtaining the widest spectrum of knowledge and experiences from owners of these precious vehicles
in order to make an informed decision.

I would encourage owners/members to revert back to this forum for longer discussions and making use of the social media groups only
as a "FOR INFO" tool?