FWIW, my 27,000 mile MKS that I purchased used showed about 1/3" of oil on the dipstick when I inserted it into the intercooler. I used an assortment of tubing, a brake bleeder container, and a household vacuum to suck out the oil. In the end, I did not get out very much oil, but it does bother me that ANY was present. I was hoping to see none. I would guess I evacuated about 1/2 oz.
That being said, if that was the amount present after 27,000 miles, I'm not sure it would ever reach a point of hydrolocking the motor. I will continue to monitor the amount to see if any action beyond a semi annual cleaning is necessary.