StefanM skrev:
I do not think anyone can say for shure and I really does not believe they have different rubbercompounds in parts using such oils. One thing to bear in mind though is that if you use a different fluid leakage may occour. If you for instance use a opel servo that has been used with chf and then adapts it to a 240 gear and use ATF there is a chance that leakage might occour due to that. I think seals adapts to the fuid that has been used and if something else is used it might go wrong totally. (or work just as fine)
There are a range of different materials available for sealings that are in contact with oil, depending on what type of oil and area of use the hydraulic system has (temperature range, wear and tear caused by "contact surfaces", system pressure, type of oil and much more).
Most common is probably nitril and viton (viton usually occurs in hydraulic systems with tougher conditions, e.g. aggressive oils and has almost twice as high temperature resistance compared to nitril rubber- which only can handle about 100 degrees Celsius).
BR