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looking for replacement oil

R rbthibodMember
Hello Forums,
i have been doing some research on my own but i am still not quite sure of how we should approach the propblem at hand, so i will come to the forums for some sage advice i hope...lol.

Problem: Systems currently use phosphate Ester fyrquel 550. iso 100. the oils are begining to go bad and turn into an acid. a couple FAC have bought some very expensive filtering system trying to reduce the acid in the oils. The reason for this filtering systems is they no longer make Fyrquel 550 ( phosphate ester ). we need the viscocity to be 100+. the systems are old and our budget does not allow for a total overhaul. i have found another oil that has all the similiar qualities and seems like it would work but the oil is a ( PAG ). i am unclear if we can just drain and clean our systems and completely swap out oils without issues. what is so different between a PAG / Phosphate Ester?
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R renewaMember
Phosphate esters belong to the HFDR category of fire resistant hydraulic fluids where as PAG (Polyakylene Glycol) belong to the HFDU category. HFDU also includes polyol esters. The issue are compatibility with seal, paints, metal, packings and hoses. Typically both the fluid manufacturer and the system manufacturer should be consulted to determine the suitability of one category of fire resistant fluid to another. As an initial, it may pay to consult another supplier that can supply a phosphate ester fluid preferably closely matched to what you are using.
L lubesMember
I have done a lot of work with PAG fluids for a long time. I will tell you that even though Phosphate esters and PAG are compatible, they do have a chance for things to wrong. Think about it, if you have 5% of the phosphate ester in the system you have 5% of their characteristics. PAG's will clean the system but, depending on the system condition you may or may not be able to get away with a change out. Forward testing needs to be done before going this route. I would recommend you contact a company that does nothing but PAG fluids like American Chemical Tech or call Lubriplate (Mike Wrockledge). They can answer more information about this for I am have moved out of the lubrication world. They do have a ISO 100 and I will say that if you make the move to a PAG you will be very happy with the performance. Ask them for references for they have some in the VA and NC area around you.
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