Originally Posted by Warhorseforever
To pay someone to do it would be about 10,000 for Diesel Toyz in AZ to do. DIY I would guess it would be about 7-8,000. As far as I know all you have to do is filter the oil, get a second fuel system and switch it to oil when the motor is warm.
Big money. You can't convert your current engine, it has to be replaced with a diesel. Engine swaps are all about little details to get them right. Even if you can do all the work yourself it is questionable whether it will ever pay off for you. If you have the money and this is about wanting to be green and reduce your consumption of foreign oil and you will keep the truck forever, then go for it. If it's about reducing your fuel bill, forget about it. 7-10K dollars buys a lot of fuel.
OP, you might be thinking of WVO. I think that's what Warhorse is referring to as well. Biodiesel can be bought at a pump and isn't that much cheaper than regular diesel. WVO (waste vegetable oil) is different and can't be left in the injection system at shutdown. You get used fryer oil from a kitchen somewhere, filter it, and put it in a seperate tank. The vehicle has to be started on regular diesel, warmed up, then switched over. You then switch to diesel again to shut it down.
I would love to have a diesel Tacoma, but I want it for lower cost of operation. There is no practical way to make that happen unless you can front 10K dollars to convert an existing vehicle, then drive it another 200K to maybe get your money back. That's assuming that the modified truck does not become a maintenance nightmare, get wrecked, etc.