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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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