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Old 11-29-2021, 10:28 AM   #1
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What type hydraulic fluid??

I am new to my 2007 Monaco Diplomat 40 SKQ. While preparing for a month trip I see that my power steering fluid is low. Before I buy any fluid can someone tell me what specifically to buy? The manual says to use 15-40W engine oil. Is that correct? Is it the same oil that is used for the engine??
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Old 11-29-2021, 10:34 AM   #2
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Have you looked on the reservoir itself for a label?


There is not a universally used fluid. Some systems are designed for motor oil, some for ATF and some for hydraulic fluid. I would NOT mix them.


You may also get a hint from pulling the dipstick to see if you can identify the fluid.


And, with the system being sealed, if level is low, find the leak.
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Old 11-29-2021, 10:49 AM   #3
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Quote:
Originally Posted by rogerlamb View Post
The manual says to use 15-40W engine oil. Is that correct? Is it the same oil that is used for the engine??
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I suggest you double check your Owners Manual. It would be very unusual to use engine oil in a hydraulic system. Engine oil does not handle the high pressures as well.

Most commonly used is Hydraulic Oil and Transmission fluid (i.e. Dexron III which is basically a hydraulic oil with red dye and some detergent in it).

Dexron and Hyd Oil can be used interchangeably in your power steering/hyd reservoir.
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Old 11-29-2021, 10:52 AM   #4
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I suggest you double check your Owners Manual. It would be very unusual to use engine oil in a hydraulic system.

Well, Delo 400 15-40 is exactly what our first DP used. No issues in 170,000 miles with two filter changes it that time.


Again, suggest you VERIFY what is in your system and continue with it. Find the leak and if the filter(s) have not been changed in the last couple of years, to that as well.
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Old 11-29-2021, 03:46 PM   #5
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The 2007 Diplomat Owner's Manual is very confusing. It's saying the factory fill is 15W-40 but to add, only use Dexron III.
The owners manuals for 2006 & 2008 are the same: Filled with 15W-40, if adding, use only Dexron III.

2004 & 2005 Diplomat just had Dexron III.

I wonder what was going on with Monaco those days.
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Old 11-29-2021, 03:57 PM   #6
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Quote:
Originally Posted by rogerlamb View Post
I am new to my 2007 Monaco Diplomat 40 SKQ. While preparing for a month trip I see that my power steering fluid is low. Before I buy any fluid can someone tell me what specifically to buy? The manual says to use 15-40W engine oil. Is that correct? Is it the same oil that is used for the engine??
Newbie

This won't help with this problem but lots of good info. I actually had the jiffy splice problem that's mentioned.


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Old 11-29-2021, 05:26 PM   #7
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Its been discussed that that any of the three could be used. It should be easy to tell 15-40w from AW-46, ATF by color and feel.
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Old 11-29-2021, 05:59 PM   #8
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Originally Posted by Lowflyer1 View Post

I wonder what was going on with Monaco those days.
The manual writers and coach builders weren't on the same page!

Like already suggested, get a small sample on a paper towel and check the color.
Red will be ATF, yellow AW-46 HYD fluid, golden brown engine oil.
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Old 11-30-2021, 07:53 PM   #9
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I would try to take a sample of whatís in there, check the color and consistency, you should be able to tell if itís motor oil or hydraulic fluid, jmo.
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Old 01-13-2022, 10:04 AM   #10
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If I have a 1996 monaco dynasty witha 300 cummins and I have Dextron 3 ..should i drain old fluid and add new to large canister? its been in there forever.
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Old 01-13-2022, 10:05 AM   #11
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Hydraic fluid drain and change or not

If I have a 1996 monaco dynasty witha 300 cummins and I have Dextron 3 ..should i drain old fluid and add new to large canister? its been in there forever.
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Old 01-13-2022, 10:39 AM   #12
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Yes, and you'll find 3 filters in there stacked on top of each other that will need to be replaced.
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Old 01-14-2022, 06:24 PM   #13
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Thanks, is there a best place to buy ? And what type or number are they ?
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Old Yesterday, 09:16 AM   #14
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Quote:
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Its been discussed that that any of the three could be used. It should be easy to tell 15-40w from AW-46, ATF by color and feel.
By feel? Really?
You're saying you can tell the difference, blindfolded, with a drop or two of each oil type on your finger tips ...
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