What Hydraulic Fluid should I use with my MTS Machine?



What Hydraulic Fluid should I use with my MTS Machine?




MTS previously used Mobil DTE 25 hydraulic fluid in-house for our servo hydraulic machines. This oil is no longer being made.


MTS now recommends the use of Mobil DTE 20 Ultra Series 24, 25, and 26.  


Mobil DTE 10 Excel Series is recommended as a Zinc-Free hydraulic fluid alternate to Mobil DTE 25 when a zinc free oil is required. 


In addition, MTS recommends the use of Shell Tellus S4 ME (Extralong life) and Shell Tellus S3 M (Long life). MTS does not recommend the use of Shell Tellus S2.   


Never mix fluids or use an "equivalent" fluid.  Other fluids have caused damage to MTS machines despite their equivalent claims.  


You can also use Mobile SHC525 if available but it’s much more expensive because it has a higher flash point.  


Note: Shell Tellus 46A was also an acceptable fluid to use but has since been discontinued by the manufacturer.  


Notice:  There is one exception. For the model 512.04 HPU the recommended oil to use is Mobile DTE 26 due to the higher operating temperature of that HPU.  

 When adding fluid always use a transfer pump such as the MTS model 590.01 (part number 005-149-201) that can provide 10 micron or better filtration.  Most commercial hydraulic fluids, even when brand-new, exceed the maximum amount of contamination allowed in MTS hydraulic systems.


For Suppliers of Mobile Industrial Oils


Mobil Oil Industrial in the United States 1-800-662-4525 


Exxon Mobile's counterpart in Europe 420-2-214-56426.  Their email is



ExxonMobil Egypt  (S.A.E.)

1097 Cornich El Nil St.

Garden City,

Cairo, Egypt

Telephone:  +202 27916 200

Fax: + 202 27958 221


Keary is the author of this solution article.

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