I've been researching adding full WVO capability to my '85 300DT. I'm looking at adding a trunk mounted tank and using engine coolant to heat the tank and supply line (hose in hose). So far I've been using Joshua Tickell's "From the Fryer to the Fuel Tank" as well as some net research to plan the system.

Here's my concern: my coolant temp typically runs only as high as the first line above the 40C mark on the instrument cluster (= what temp?). It usually doen't even aproach the 80C mark unless I'm in stop/go traffic for longer periods of time. According to Joshua's book, WVO temp should be brought up to ~70C to avoid coking injectors. It doen't look like I can reach this temperature through a coolant based heating system during regular driving.

I know a lot of forum readers use WVO mixed w/diesel but I'm concerned about longer term problems associated with the viscosity of WVO (ex: coked injectors).

Any ideas on the accuracy of the dash mounted temp gauge? Any other inputs on my concerns?

-John

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1985 MBZ 300DT
1969 MBZ 220d
1984 MBZ 300TDT
1981 VW Vanagon