You should NEVER run "straight" WVO. Always always always cut with 10% diesel.

There have been tests done on the polymerization properties of diesel, biodiesel, SVO, WVO, and WVO cut with 10% diesel. Only straight WVO (even filtered and dewatered) causes polymerization issues. When cut with D2, that polymerization is about 99% eliminated. So... if you're running SVO, then if it's hot enough it's fine. Not the case with WVO.

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'79 300SD
'82 Chevy Chevette diesel