Lovecraft is not well thought of for Mercedes:
http://www.mercedesshop.com/shopforu...ight=Lovecraft

If you do a search on that site that I put the link up for you will see that there is no end to the negative comments about Lovecrap.

Here is another recent discussion about pros and cons of which way to go:
http://www.mercedesshop.com/shopforu...ight=Lovecraft

I could link you to pages and pages of just links. It is generally agreed that one of the most important things about running a veg based fuel is getting the viscosity right. By doing so it places less strain on the pumps and flow/atomizes correctly through the injectors.

There are three basic ways to adjust viscosity. Cause a chemical reaction as is the case with biodiesel, heat the straight veg oil and the heat will thin it out, or blend the veg oil with a thinner to lower the viscosity.

I choose the latter. With relying on heat to thin the WVO, a single tank system is not practical. There is no way you will have the oil at 160* at start up. The engine will have to be running for at least 5-10 minutes or more to get up to 160*. During that time the WVO is not your vehicles friend. By thinning my fuel is already at a lower viscosity when cold.

I could go on all day. In short, it works for me. I'm tired of typing but if you would like feel free to PM me and I'll send you my telephone number. Don't worry, I'm not selling anything.