Hydraulic Steering Fluid lifespan

[DewRonInc]

Same ratings and same stuff

[DewRonInc]

Aeroshell is our choice

[DewRonInc]

So many people are locked in thinking ford oil or gm oil has to be ran, plus most think it has to be say 5w20 for instance. The oil autos call for is due to cafe ratings, oil that got best fuel mileage around a track.

[Old Syko]

So many people are locked in thinking ford oil or gm oil has to be ran, plus most think it has to be say 5w20 for instance. The oil autos call for is due to cafe ratings, oil that got best fuel mileage around a track.

This is true but only to a point since there is more to it than that. Engines with VVT and multi-stage oil pumps can require specific viscosity oils for proper performance and engine life and not just fuel mileage.

[DewRonInc]

We build and use race engines and stock also, I can tell you, nope

[DewRonInc]

We test oils of all kinds, using black stone labs.

[DewRonInc]

First number represents how the oil flows @ 32 degrees, second number represents the base stock viscosity @ 75 degrees. Been around VVT engines for a while.

[DewRonInc]

We have service vehicles that have in excess of 400k miles and have never ran the oil called for by manufacturer. That being said, manufacturer’s are in the business to sell cars or trucks. They get massive tax credits for meeting fuel mileage guidelines, not how long engine performs for owner of said vehicle.

[TampaJim]

Three most important aspects of a finished lubricant in a specific application ... viscosity, viscosity and viscosity.
After we get past those three, we start concentrating on other variables coming into play for different reasons.

I'd never, ever recommend moving outside of the viscosity range designs from an OEM. Good news, options exist.
For example, the fill cap might have 5W20 printed on it. But inside that pesky manual, it's quite often a variable.

[DewRonInc]

I don’t distantly disagree, except, after testing of components, a high quality synthetic lubricant let’s say 10 over on base stock, will offer far better protection for components as long as lower number, it flows like 5w at 32 degrees number stays the same, life is good, cold starts will affect wear far more than a improved shear

[TampaJim]

I don’t distantly disagree, except, after testing of components, a high quality synthetic lubricant let’s say 10 over on base stock, will offer far better protection for components as long as lower number, it flows like 5w at 32 degrees number stays the same, life is good, cold starts will affect wear far more than a improved shear

For the average person, and situation, 99% of the time, it's much, much better to point at the cap, or manual.
Over my career, it was painful to watch folks "engineer" lubricant applications beyond specification. Most poorly.
Even when testing was involved, too many couldn't read the reports AND understand what to actually monitor.

Back to the original thread topic. Feel free to use any MIL-PRF-5606J aviation hydraulic fluid. It's perfectly fine.

[DewRonInc]

For the average person, and situation, 99% of the time, it's much, much better to point at the cap, or manual.
Over my career, it was painful to watch folks "engineer" lubricant applications beyond specification. Most poorly.
Even when testing was involved, too many couldn't read the reports AND understand what to actually monitor.

Back to the original thread topic. Feel free to use any MIL-PRF-5606J aviation hydraulic fluid. It's perfectly fine.

Yes sir, true

[high 2]

Boys, we’ve been schooled.

[TampaJim]

Might have cheated just a bit ...

[MikeF]

I'm really sure that Teleflex (Baystar) fluid is produced by a leading manufacturer of hydraulic fluid.
They don't make it themselves. No refinery, no blending plant. Just like Yamaha, Mercury, Honda, etc.

And, yes, I'm positive. There's no reason not to use any approved MIL-PRF-5606J fluid, just pick one.
AeroShell Fluid 41, Phillips 66 X/C, Mobil Aero HFA, Texaco HFA or Chevron Aviation Fluid A. All good.

Will all these fluids mentioned play well together if mixed?

Thanks

[styler]

Guys I didnt mean to turn this into an oil debate. wow.. I agree that there's other fluids that will work just fine but rather than take a guess I went with the factory recommended fluid. Yes its pricey but it was a one and done deal for me.

[BMCD]

The suggested check is in place for a safety reason, hydraulic fluid should not go bad. water in the system, leaking gaskets, and connections being retightened

[TampaJim]

Will all these fluids mentioned play well together if mixed?

Thanks

Yes, thru various aviation rules. Compatibility is VERY important at 38,000 feet.
Aviation hydraulic fluids are purchased by OEMs, including marine steering systems.
We sold them for carwash equipment, automotive struts, etc. Greases as well.

[DewRonInc]

Guys I didnt mean to turn this into an oil debate. wow.. I agree that there's other fluids that will work just fine but rather than take a guess I went with the factory recommended fluid. Yes its pricey but it was a one and done deal for me.

Seastar fluid is nothing more than a first run aero fluid, aero shell, even Texaco has a hydraulic fluid for aero service, any of that will work like a charm, as far as mixing, I have never been a fan of mixing fluids actually. Although all of them will be mil spec and should play well together even seastar fluid with them. Primary is viscosity concerns with mixing them and how temp affects each of them

[TampaJim]

Seastar fluid is nothing more than a first run aero fluid, aero shell, even Texaco has a hydraulic fluid for aero service, any of that will work like a charm, as far as mixing, I have never been a fan of mixing fluids actually. Although all of them will be mil spec and should play well together even seastar fluid with them. Primary is viscosity concerns with mixing them and how temp affects each of them

Mixing AV fluids is fine, for the same application & approval. Just be sure.
If the MIL-SPEC is the same, the viscosity will stay within approved range.
Aviation specifications are so old, Moses used them in crossing the sea.

Mixing non-aviation fluids, not necessarily a good idea, they can & do vary.
When unsure, ask a specialist. Major lube companies have a free hotline.

Greases have the highest degree of incompatibility. Knowledge is needed.