Quote:
Originally Posted by Anker
A little more explanation.
The issue is that diesel acts as a lubricant for the fuel injection system. Pure gasoline will wash the lubricant away and cause extreme wear.
As long as there is enough diesel oil in the gas/diesel mixture to act as a lubricant you won't damage the car.
Of course, its better to be safe than sorry.
I doubt there was any damage to the rental car that started this discussion. 20% gas should have enough lubrication left.
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the issue is also the temperature of combustion; gas burns hotter. in a vw that may well have aluminum heads on an iron block then you can quickly pop a head gasket when things heat beyond design tolerances (expansion). i killed a diesel rabbit that way many years ago.