The red diesel that farmers use is not the same as road fuel with red dye in. It is a lower cetane rating of 46 compared with DERV which is 52.
With the new common rail and very sofisticated tractor engines we find that sometimes the red diesel which is A2 is not good enough, so we have to use an additive. I use Stanodyne and put it in the bulk tank before a fuel delivery. I have found that the tractors and combine are more frugal with the additive.
The red diesel which is the same as DERV is branded as EN50, I have tried to get this but the fuel firms tell me they do not sell it. It is a little dearer if you can get it.
I strongly recommend your friend does not use red, not only won't his car go worse he will get into big trouble if cought, as has been said before.
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