Ok , well I bought the 88 ford ranger diesel wvo truck memorial day weekend. It has a 3.0l diesel out of an 85 300dt along with the auto transmission. It also has a chevy transfer case and ford f150 front and rear ends. It has 6" suspension and 3" body lifts, 33.5" mud tires, 40 gallon wvo tank. I've been driving it about 500 miles a week since then. It doesn't have air, the paint is not the best, it lacks power on the interstate, can be a little hard to control on bumps. But it runs on wvo and costs little to operate.

Here's what it had when I purchased it:

40 gallon wvo tank, oil filter from TSC attached to custom mount on the exhaust pipe, SS pipe running wrapped around the exhaust up to the engine bay, 3 turn tube in tube heat exchanger, 3 way valve with bottom ports capped, T fitting between return and pump to only use one fuel line.

Only having one feed line for wvo meant if any air got in the system, it was a pain to get it out. It also meant the oil would heat better as it was exposed longer. I found out the hard way about the air when a bit of water got in my tank before heading to memphis. I was pulling a car trailer and a heavy load. The water in the fuel boiled because of the high heat the exhaust had pulling the load. I stopped every 15 miles or so and purged the air. I was soon tired of this and ran the rest of the way on straight diesel.

In July, I added a fuel return hose back to the top of the tank. It means it is going through filters a little quicker, but it keeps the air out now. I've pulled my boat to priest lake several times now with no problems. this also means that it will not heat as well come winter. I moved the wvo filter from under the truck on the pipe to where the wiper washer bottle was. The 3 coil heat exchanger is directly in front of the filter now. The T mentioned above is only used for diesel fuel to keep return from getting in the diesel tank. The 6 way valve is now moved to the other side to give quicker purge times, and uses all ports. I'm looking at a plate heat exchanger which I will install after the filter to heat the oil further right before going to the fuel pump. The return is heated and I will wrap with insulation before winter returns. This should help warm the tank in the back some. There is an exhaust heater going to the bottom of the tank which doesn't work well in my opinion. I may have to put some heat in there before winter. I'm considering a glow plug or two mounted just beside the intake pipe. This can be switched on in the winter and wired to come on when the engine is on.

the tank is sealed from the bottom except for a couple ports and the feed line. may be tough to put a coolant heater in there.

I make biodiesel to start it up and shut it down. I also use it in my wife's 300d. That is my next wvo project for next spring.