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  #1  
Old September 14th, 2020, 16:08
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techno1154 techno1154 is offline
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Synthetic oil?

Referring to Royal Purple, Amsoil etc. How often you come across someone who have used it in the power steering? I will be replacing the steering gear this weekend with one that have been rebuilt, drilled and tapped for ram assist by Red Neck Ram.

My online searches indicated as many "No, it is not necessary" to "It is OK but a waste of money". There are also a number (in the minority) of people that are using synthetic in their XJ. So far, I usually fill it with what is on the store shelf when I walk in.

What is really strange is, the CD based manual for the 1996 year model do not list power steering fluid. It does however contains in-depth procedures of how to remove, repair, test and adjust every part of the steering system.
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1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #2  
Old September 14th, 2020, 19:10
RCP Phx RCP Phx is offline
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Re: Synthetic oil?

I've run Amsoil for over 50yrs in every application, but not as power steering fluid. Total different requirements, in my PSC system I use straight "Mineral oil".
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Old September 15th, 2020, 06:12
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8Mud 8Mud is online now
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Re: Synthetic oil?

I'd use a brand name power steering fluid, Shell etc. I've had some issues with odd named brands foaming (noisy). I've topped off with liquid Moly brand synthetic. I was pleasantly surprised how a small amount of synthetic mixed in with the the normal stuff really quieted things down. I went from occasional cavitation noise (groans) to near zero cavitation noise.
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Old September 15th, 2020, 07:49
RCP Phx RCP Phx is offline
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Re: Synthetic oil?

I will add that PSC recommends only the use of Mineral oil.
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  #5  
Old September 15th, 2020, 14:27
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techno1154 techno1154 is offline
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Re: Synthetic oil?

Quote:
Originally Posted by RCP Phx View Post
I will add that PSC recommends only the use of Mineral oil.
Mineral oil is a total different animal. My days of working with heavy equipment, mineral oil was required in some areas including brakes brakes. It remains a lot more stable at high temperature wen compared to petroleum products.

However, in my case, I do not think it is necessary. The steering gear and pump are both OEM. I am only adding a ram which replaces the steering stabilizer.

Isn't mineral oil a synthetic product?
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#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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Old September 15th, 2020, 16:05
RCP Phx RCP Phx is offline
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Re: Synthetic oil?

Not even, but you need to know that it's more like a hydraulic fluid than a "lubricant".
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  #7  
Old September 15th, 2020, 17:03
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techno1154 techno1154 is offline
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Re: Synthetic oil?

Quote:
Originally Posted by 8Mud View Post
I'd use a brand name power steering fluid, Shell etc. I've had some issues with odd named brands foaming (noisy). I've topped off with liquid Moly brand synthetic. I was pleasantly surprised how a small amount of synthetic mixed in with the the normal stuff really quieted things down. I went from occasional cavitation noise (groans) to near zero cavitation noise.
I too have had the same experience using the discount store fluids of various name brands only to remove the return hose and drain it then refill with another brand. This time I want to do it once then move on to other things. I think now is a good time to replace all the fluid since I will be replacing the steering gear.

Quote:
Originally Posted by RCP Phx View Post
Not even, but you need to know that it's more like a hydraulic fluid than a "lubricant".
I am not sure I understand why one is a hydraulic fluid and not a lubricant,...or did I read this wrong? Hydraulic heavy equipment uses the same fluid to lubricate the pumps, valve body and rams. An external fluid cooler is added to keep high temperatures at bay.

So this mineral oil (formally consumed by old ladies to aid bowel movement a.k.a. caster oil) is what you use in the XJ OEM steering?
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Patrick

#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #8  
Old September 18th, 2020, 09:01
Black1990jeep Black1990jeep is offline
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Re: Synthetic oil?

I use standard clear power steering fluid in my xj. My vw van takes red atf in the steering. I was told do not use atf in the xj steering. I run the ORielly brand fluid. I also run an inline filter

https://magnefinefilters.com/

have fun in your jeep!
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  #9  
Old September 22nd, 2020, 18:46
EvaB99XJ EvaB99XJ is offline
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Synthetic oil?

I use royal purple synthetic in my power steering pump on my XJ.

I replaced the leaking factory pump
with a rebuilt pump and filled it with Lucas power steering fluid. On the highway after a few miles it would start making lots of noise. If I stopped for a few minutes and then got back on the highway it would be quiet for a while and then start making loud noises again. I think the fluid was foaming.

I put on a power steering cooler and replaced the fluid with royal purple synthetic - no more noises.

In the past Iíve used red line synthetic and had good luck with it but itís hard to find - the auto parts stores here carry royal purple and it does the job ok.
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  #10  
Old September 23rd, 2020, 17:00
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techno1154 techno1154 is offline
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Re: Synthetic oil?

Thanks to all who have replied. I always enjoy the opinion and experience of others.

I am leaning towards Amsoil. I have using Amsoil in the engine, AW4 and the T-case for more than 200,000 miles. The odometer now reads 333,480 miles.
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Patrick

#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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