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Message: <blockquote data-quote="Tazza" data-source="post: 7403" data-attributes="member: 82">You can run engine oil in the hydraulics and chain case.I used 15W40 in my entire machine until i couldn't get a good price on it any more and now use 20W50 in hydraulics and chain case. The engine still uses 15W40 diesel grade oil.The machine is old so warranty isn't an issue, use engine oil as its far cheaper than from bobcat.As for the oil foaming, it will not foam unless you have air in the system or the oil is too thin, like hydraulic oil is.You simply can't drain ALL the hydraulic oil from the entire system either, you have oil in the cylinders, oil cooler, hoses/tube lines motors and pumps you simply can't get out short of removing and draining each piece.</blockquote>