You can but why? The high dollar steering fluid is non flamable ( aviation spec I think ). The other stuff isnt. You can use seastar in your jack but not vise versa. Clear as mud? Cheaper just to go to autoparts store and save good stuff for boat.

Mike T

 

left over

I have some left over, rather than just waste it.

 

The last time I bought Sea Star fluid it was 11 or 12 dollars a quart. You can get hydralic fluid much cheeper.

 

I have some left over, rather than just waste it.

Put it in a container and store it on your boat for emergency use. Develop a leak on the water and you will wish you had the whole quart. I have been on two boats where the helm seal started leaking over the years Only a little but enough to get real scary trying to steer a channel to the boat ramp. The more you turn the more fluid leaks. We lost steering completely at the ramp and had a real problem lining up with the trailer. 4 ounces of oil would have helped. How do I know. I tested back at my buddy's house. Your call.

 

I'm with Gray on this. I carry a quart (well, what's left of it) on the boat right next to the extra gallon of oil........just in case.

 

Mineral oil will also work.

 

seastar fluid

I sold the boat , but I kept the bottlejack though.