I go back and forth as is convienient. Have probably run 20% bio tankfuls in last 100k miles.

If filters were an issue would not occur only when burning Bio.

Is a result of bio's lower cetane rating as compared to D2.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)