@lexluthermiester A lot of your points are good, however oil has a terrible thermal capacity compared to water. 1.67KJ/Kg vs 4.19KJ/Kg for water, so the oil would warm up more without actually absorbing as much heat. It'd be interesting to see how much difference there would be in practice though.
https://www.engineeringtoolbox.com/specific-heat-fluids-d_151.html
That not only depends on the formulation of the oil used(not all mineral oils are equal), but also how it's used and the thermal load applied. In the case of PC cooling, CPU's and GPU's can not physically over-saturate the oil with heat. Additionally, the heat is bled off through the radiator so quickly that it can never be a problem. So even though the Specific Heat of mineral oil is lower than water, it's ability to transfer heat is equal to or better. Given the heat being applied, it's a non-issue and the benefits
far outweigh that point. For this reason, mineral oil is used as a thermal dissipation solution for sealed industrial electrical transformers. That and the fact that it, as mentioned previously, is non-electrically conductive and lasts a long time as it will not break down or go rancid.
I'm speaking from experience. Stopped using water as a liquid coolant years ago because mineral oil always seems to perform on par or better than any formulation of water tested. The benefit of not killing or corroding components in a given system should a leak happen can not be over stated, discounted or dismissed. For that reason alone, I will never go back to water based coolants. If you have the means, give it a try yourself.
I will continue to use antifreeze as I have not found a product as good yet.
Having tested antifreeze as a coolant for PC's, I offer confirmation that it is a top-tier water based coolant. There is a reason why it is used in automotive cooling. My testing showed that a 15%-85% coolant/water mix rendered the best results.
Edit; And I've never seen antifreeze do anything to damage
properly formulated acrylic. Cheap crap acrylic? Maybe. But as a general rule, acrylics used for PC cooling are literally made with antifreeze in mind as every manufacturer knows that some people use it. The notion that antifreeze damages acrylic parts or coolant tubing is laughable.
