Date registered: May 2011
Vehicle: '02 UNIMOG® UGN. until its deleted or passes scrutineering.
Location: Ontario, Canada
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My point is just that what you posted. The ppm of sulphur in the fuels of yesteryear Germany going back to the 70's was 300 ppm.
lm not sure what the levels were in the 60's or further yet, the 50's. They can only be the same or even higher.
What we do know is, the engines manufactured (Unimog ) back then reflected the fuel they were fed.
Here in North America, the fuel had changed. Just one of those changes was a fair to say reduction of sulphur in the fuel (low sulphur fuel ) and then again to ultra low sulphur fuel. This has only been since the latter 90's, taking off since about 2003 and beyond.
The characteristic of that sulphur was lubrication of the fuel pump. With such low levels today, those old fuel pumps are now lacking the necessary lubrication because the fuels today are not available for those applications.
The end result is fuel pump failure or catastrophic failure. Steps can be taken to slow that down. Fuel additives. However, it isn't sulphur, rather another type of lubricity means. (That's why l didn't include cooking oils or bio-diesel)
There is no doubt that fuel pumps are more than expensive on these engines. End result, do something now, do what ? The older the Mog, the more critical it is. Are these older vehicles going the way of the dinosaur ?
Cetane on the other hand promotes a quicker ignition of the fuel and a more complete burn reducing particulates.