better quality oil will stay liquid at lower temps. you could also cut w//any amount of diesel/kero, instead of gas. dont add more than 20% rug, ive heard.example- 60% diesel, 40% wvo. and use an additive like power service.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.