Could be that diesel is purposely over-engineered and refined to be too strong for non-PD engines (which would be harmless) instead of risking damage to PD engines (of which there are a lot on Britain's roads). Don't forget, if you stick anything random in your tank other than BSEN590 diesel then that's your fault. If the refineries sent out a bad batch of "standard compliant" diesel and that causes problems, then they could be held liable. It's in their interests to keep Britain's motorists on the road and out of their bank accounts, otherwise there could be plenty of cases where drivers filling up with a £60 tank could claim ten times that in engine damage. Not the case for additive manufacturers like Miller, and definitely not the case for something which isn't supposed to be anywhere near a car's fuel tank like 2 stroke oil.

Non pd engines were about long before the pd was, and there's nothing suggesting that the genentic make up of full has ever been changed to suit the pd. I can't see the pressure being a problem

Edited 7 September, 201213 yr by wilsy7

This link is very informative - and covers much more than just the injectors: well worth keeping for reference when trying to work out what does what:

http://pics.tdiclub.com/data/516/VW_TDI_with_PumpeDuse.pdf

My take on this is that whilst it is true that the film strength of the oil will shear at final injection pressures, it isn't too important because the lubrication has been done and (unlike engine oils) the oil is not used again so any loss in lubricative qualities isn't a problem. Returned fuel hasn't undergone the final part of the action.