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Old February 4th, 2018, 16:38   #4
Geordi
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Join Date: Jan 2002
Location: Somewhere between Heaven and Hell. But it is really hot here in S. Florida...
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Yeah, why the dislike for bio? My diesels (TDI and CRD) have all run BETTER on bio.

What is the risk factor you ask? Well, if you haven't run a high blend in a long time, it has the potential of running through your fuel system like liquid brillo and scouring off all manner of goo and nasty scum and stuffing it in your filter. This usually only happens once or twice (if you keep it up with the high bio) and then it will calm down. The other risk factor is cold temps, above B50 is a bad idea for less than 40*F, and clouding / gelling is possible below 32*F. B20 is generally OK down to about 20 or so, but B5 or B10 is OK overall in the same ranges as #2 Diesel. Actually, when the fuel is winterized with #1 or K1, having some bio may be helpful to put back some of that lost lubrication value!
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