I like using Sea Foam in gasoline, but for diesel I use Stanadyne Winter 1000 and Performance Blue Bottle. Never had a problem even in -20F temps when treating summer fuel.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).