I looked at one of the MSDS's. New Jersey lists it as requiring mineral oil precautions. But that does not mean it is a mineral oil. It is also said to be "inherently" biodegradeable, which may mean it is not a mineral oil. Do you know off hand whether it is a mineral oil? Also, color is not described, but the name makes me wonder. Is the oil highly colored, like purple? If it is not a mineral oil, the near IR method may not work at all. We would need to check the IR properties of the oil.
The fact it is in a motor is good news. I was thinking it was in some sort of tank, but a motor will keep the oil-water mix agitated. I have a small, 5 HP gasoline-powered sprayer for the farm. You can easily tell if any seals are leaking from the water side into the oil side (mineral oil). As mentioned above, turbidity may be a simple answer.
John
The fact it is in a motor is good news. I was thinking it was in some sort of tank, but a motor will keep the oil-water mix agitated. I have a small, 5 HP gasoline-powered sprayer for the farm. You can easily tell if any seals are leaking from the water side into the oil side (mineral oil). As mentioned above, turbidity may be a simple answer.
John