The Fill Up For Free Straight Waste Vegetable Oil GreaseCar SVO / WVO Network

There's this site, which I've never used.
If it was me, I'd try posting on Craigslist in some
of the cities on your route. Keep us posted on your
success with getting oil.

Good Luck and have a great trip!

Jeff

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1984 300SD 300,000 miles--two tank WVO setup
2.88 diff & 500SEL anti-squat rear end