first one ive seen but i cant say i like it
oil would not be in it very long so i would be surprised if temp goes up much at all
the water feed will be around 80 deg c as thats about what a diesel runs at , its going to go thorough there in a few seconds so you might add a few deg to the oil but not much , would have to be a fair bit longer to me to bring the temp up to any worth while difference (btw do you feed it from the heater pipes and if so do you feed it before or after the heater , before better after no good )
any one know if theres an auto rad with oil cooler for a tranny or one from another car that would work , they have a bigger pipe work inside and if the veg oil went through that it would get much better heat into it and would just need some extra pipe work to join it up






