The pump on my '96 has been whining and though I have a used pump, I thought I would just flush out the fluid first. I've read some good stuff here about ATF vs. hydraulic oil and decided to go with hydraulic oil. I couldn't find the much praised Mobil DTE 24 iso 32 but did pick up a gallon of regular iso 46. I wonder if this oil is too thick. It gets mighty hot down here in the summer so maybe it will thin out.. what do you guys think?