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Message: <blockquote data-quote="M700man" data-source="post: 3558" data-attributes="member: 365"><p>Just to muddy the water a little, I just don't think 10W30 is satisfactory as an hydraulic oil, even though at the moment I am running my 742 with it. Seems to me, that given the pressure and the heat that it goes through, it's quite possibly not getting the job done after several long, hard hours of work. As I have read in several Bobcat factory manuals, the motor oil can be used if "Bobcat Oil" is not available. Having researched this through a local oil dealer, I was told that "Bobcat Oil" is supplied by the lowest bidder. So, perhaps Shell this time, Warren the next, etc. He looked it up in a manual which reccomended Mobil DT15M. I have run this oil in my other Bobcats and got very good performance. However, I don't know if it extended the life of the hydro system. The key with hydraulic oil is that when the machine is cold, the oil should be thin enough to be picked up easily by the pumps and not thin down when it gets hot, as all oils do. So that range is the secret to a quality oil. I can't see this happening with just conventional motor oil. Just my .02. Thanks, John</p></blockquote><p></p>