All WVO is not created equal. No WVO I know of is the viscosity of #2 diesel at 80 degrees (even canola).

Do you check it for water? Whats your filtering and dewatering process?

Here's what Id do:
- change both fuel filters
- run a diesel purge
- fill it with #2 fuel for several tanks before doing anything else

Look on the Frybrid.com website for the 'hot pan test'.

It sounds like bad WVO. Tossing in a few gallons to your main tank (assuming its good WVO) shouldn't be giving you these issues.

Im not a WVO hater either...I run it 100% in a two tank kit.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car