Hello Steve welcome to YT! Use hydraulic oil, if your hydraulic pump seal does fail contamination of the engine oil with hydraulic fluid will harm nothing. It would not be ideal but the engine could actually operate on straight hydraulic oil for a short period a not be harmed at all. The higher detergent levels, types of friction modifiers and the moisture emulsifiers in the hydraulic oil is what would have the low risk impacts to the engine in such a scenario.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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