Hydraulic fluid: Can a substitute be used in an Endless Pool motor?

[PoolDoc]

Not trying to talk you out of using the bio-oil -- but my guess is the only reason EP is using a bio oil is to (a) promote how 'green' they are and (b) jack the price up. Again, I'm guessing, but I suspect standard oil with the same properties might last longer.

One caution: it's possible that bio oil is easier to clean up, if it leaks into your pool. If your EP set up has the pump in a submerged location, where oil leaks would enter the pool, then the use of bio oil might be valid from an engineering or functional perspective.

[dogmom58]

That was the reasoning we came up with - that if it leaked into the pool it would not be too much of a contaminant. Our pool is outside and only about a hundred feet from a lake. If the pump itself leaked it also wouldn't be too bad (it's located under the pool decking). And a petroleum product might also not be good for the liner if it came in contact with it.
The oil we are getting is the same price as EP's but at least we can get it today and not pay shipping.

[PoolDoc]

Sounds good . . .