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Message: <blockquote data-quote="mrbb" data-source="post: 138789" data-attributes="member: 13825">I believe those older machines used 10w30, but if I was you and wanted to be sure, I would just call my local case dealer, give them your vin and ask them what to use, I'm sure they would know for certain and get you accurate info! another  question I think maybe you should be asking   or food for thought is,  WHAT fluid is in the tank NOW< as what ever that is, , maybe stick with it? as mixing fluids is never the best idea, and with these older machines, , as time passed, many owners used WHAT ever they had on hand, from gear oil, basic hydraulic fluid to 10w30 too??? if your not the original owner, this can be a unknown deal?guess you have to look at fluid and go by maybe color/smell, or?? not sure if a sample can be sent out and tested if one wanted too?</blockquote>