Sloper,
My experience tells no effective change in olive oil viscosity can reached by the so called "modifying", since its viscosity could not be enhanced by it. Slight change in appearance may happen, but it does not matter. This is confirmed by some study I made on oils . The olive oil is so OK exactly for the same reasons it does not change by such a mild treatment as suggested modifying. This is due to its high oleic content. Almost unmodifiable, it stands well against all bombasted synthetics, and appears really a promise. Clean, ecological, cheap, obtainable everywhere. I guess its promising future is mixed with castor, and not mineral oil.
By varying the proportions you can have the right viscosity you "feel" good for your mix. I am studying the formula, and I will report measurements and observations on oil thread.
If you want you can send me a sample of modified oil, I will test it. Take into account at last 250cc are needed.
If you want to compare directly by yourself possible changes in your modified oil, you can make this simple test. Keep a small container with appropriate free entrance of air, such as a c/l tank, fill it with oil and let it drain freely. If it flows straightly out, measure the time needed to be empty, than compare. I guess times will not change. Take care, for this test it is necessary to obtain a continuous flow from the tank, no dropping. If it drops it is necessary to find a container with a larger output until dropping is avoided.
Pls take me informed.
ugo