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I think plain vegetable oil sold in bulk is probably the most cost-efficient lubricant additive. The question becomes how much is needed. A gallon sure seems to be enough. A half-gallon is even easier to carry along.
Some time I would like to run my own experiment in a jar to make sure that vegetable oil disperses within diesel and doesn't all collect at the top or bottom. I use soy oil.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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