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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: johns4104s on May 28, 2009, 07:43:31 PM

Title: 1981 MCI 9 Power steering fluid?
Post by: johns4104s on May 28, 2009, 07:43:31 PM
What type of power steering fluid do I top off with?

Thanks

John
Title: Re: 1981 MCI 9 Power steering fluid?
Post by: johns4104s on May 28, 2009, 08:54:19 PM
The book says (actually I have the maint on disc, which is very hard to read) says 10W-40 oil. Is this really true? What are you guys out there using?

Thanks

John
Title: Re: 1981 MCI 9 Power steering fluid?
Post by: JackConrad on May 29, 2009, 04:00:05 AM
Quote from: johns4104s on May 28, 2009, 08:54:19 PM
The book says (actually I have the maint on disc, which is very hard to read) says 10W-40 oil. Is this really true? What are you guys out there using?
Thanks
John

Yes, sorta?   Some power steering systems call for 10W-40 and some call for ATF.  I do not which call for what?  Our MC-8, which has OEM hydraulic assist, had ATF in it when we got it so that is what we have used.  We are hoping to install an integral sterring in a couple weeks and was told to run 10W40 in it.  Jack
Title: Re: 1981 MCI 9 Power steering fluid?
Post by: jhaggerty on May 29, 2009, 04:40:31 AM
I have been using 10w40 for five years with no problem. My manual says the same as yours.

Jim
Title: Re: 1981 MCI 9 Power steering fluid?
Post by: rdbishop on May 29, 2009, 06:04:29 AM
Some use the same oil they use in the engine in case the seal goes out in the power stearing pump.

Richard
Title: Re: 1981 MCI 9 Power steering fluid?
Post by: busshawg on May 29, 2009, 07:25:39 AM
I'm using straight 40
Title: Re: 1981 MCI 9 Power steering fluid?
Post by: JohnEd on May 29, 2009, 08:36:52 PM
All of these systems are parasitic drains on power and MPG.  Pure synthetic is the best lube and thinnest oil.  If it is within your reach price wise, I can't see using anything else.

John
Title: Re: 1981 MCI 9 Power steering fluid?
Post by: TomC on May 29, 2009, 08:39:05 PM
Simple- if it is red, it is ATF.  If it is brownish, it is 15W-40 engine oil.  Highly recommend you NOT use straight 40 weight, since if you get into cold weather, you risk possible pump damage from thick oil. Good Luck, TomC