Mobil Polyrex EM and Mobil Polyrex EM 103 offer the following features and benefits:


Advantages and Potential Benefits

Outstanding grease life

Outstanding long-life, high-temperature lubrication of ball and roller bearings, particularly in sealed-for-life applications

Advanced polyurea thickener

Increased durability versus conventional polyurea greases when subjected to mechanical shear forces

Excellent corrosion resistance

Mobil Polyrex EM and Mobil Polyrex EM 103 provide protection against rust and corrosion. Mobil Polyrex EM provides additional protection under mild salt-water wash conditions versus Polyrex EM 103

Low-noise properties

Mobil Polyrex EM is suitable for lubrication of ball bearings in many noise-sensitive applications


Mobil Polyrex EM greases are recommended by many major bearing and electric motor manufacturers for long-life lubrication of electric motor ball and roller bearings.

Mobil Polyrex EM 103 is more specifically recommended for applications such as vertically mounted bearings, or very large motors where a stiffer grease consistency may be required by the OEM, and low noise properties are not required.

Mobil Polyrex EM greases have been shown to be compatible with a number of ExxonMobil lithium complex greases, as well as competitive electric motor mineral polyurea products, as determined by the methodology of ASTM D6185. For specific questions about grease compatibility, contact your Mobil representative.

Key applications include:

  • Electric motor bearings
  • Fin fan bearings
  • High-temperature pump bearings
  • Factory-filled, sealed-for-life ball bearings
  • Ball or roller bearings operating at high temperatures where low oil separation is required
  • Polyrex EM for ball or roller bearings operating in noise sensitive environments


Mobil Polyrex EM meets or exceeds the requirements of:

Mobil Polyrex EM

Mobil Polyrex EM 103

DIN 51825: (2004-06)



Typical Properties

Mobil Polyrex EM Mobil Polyrex EM 103
NLGI Grade 2 3
Color Blue Blue
Base Oil Viscosity, ASTM D 445
cSt @ 40°C 115 115
cSt @ 100°C 12.2 12.2
Viscosity Index, ASTM D 2270 95 95
Penetration, ASTM D217 worked, 60x, mm/10 285 250
Penetration Change after 100.000 strokes, ASTM D217, mm/10 40 40
Dropping Point, ASTM D 2265, °C (°F) 260 270
Oil separation test, ASTM D 1742, % 0.5 0.1
High Temperature Grease Life, ASTM D 3336, Hours @ 177°C 750+ 750+
4-Ball Wear Scar, ASTM D 2266, @ 40kg, 1200 rpm, 75°C, 1 hr, mm 0.41 0.6
Low Temperature Torque, ASTM D 1478, g-cm @ -29°C
Starting 7500 9300
Running 800 1000
EMCOR Corrosion Performance, 10% Synthetic Sea Water ASTM D 6138 (Prepared As Per ASTM D 665B) 0,1 (No Rust)
Rust Protection, ASTM D 1743, Distilled Water Pass Pass
Copper Corrosion Resistance, ASTM D 4048 1A 1A
Water Washout, ASTM D 1264, % 1.9 0.8


5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Good deal.
Good price and fast shipping.
March 20, 2019
8 months ago
Great Product
Great product, works as intended
April 25, 2019
7 months ago


Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 3 questions Browse 3 questions and 36 answers
Why did you choose this?
The Lubricant Store Store
Used for AHUs and large package units on previous jobs. Very pleased with this product.
Harold H on Oct 8, 2019
manufacturer's recommendation
Paul P on Sep 4, 2019
Used for AHUs and large package units on previous jobs. Very pleased with this product.
Harold H on Oct 8, 2019
I work on electric motors and was told this is the best grease.
John L on Sep 11, 2019
manufacturer's recommendation
Paul P on Sep 4, 2019
It is what the blower calls for.
Robert M on Aug 28, 2019
It’s what’s recommended for our motors
david n on Aug 19, 2019
Best Electric motor grease
Lawrence H on Aug 7, 2019
Spec grease for motor
TRAVIS L on Jul 16, 2019
Its great for electric drive motor bearings
Jimmy G on May 13, 2019
Manufacturer recommended
Duncan C on May 9, 2019
Used by our well techs at our well sites
Liza L on Apr 17, 2019
specified motor bearing grease
chris m on Mar 29, 2019
Customer requested Polyrex EM
Liz L on Mar 25, 2019
Servicing electric motors this is the standard for electric motor grease
Richard on Mar 8, 2019
RFQ from a customer of mine.
Mike C on Mar 6, 2019
This is the Grease used in the majority of Electric Motors sold today.
Timothy T on Jan 18, 2019
great product
Dougless F on Jan 18, 2019
Reasonable price and I like the convenience of the tube.
Paul R on Dec 30, 2018
Low Price
Larry S on Dec 17, 2018
The absolute best grease
James B on Dec 14, 2018
It's what my tech requested.
Stacey L on Dec 11, 2018
GREGG P on Nov 15, 2018
Need this item for refrigeration motors
Reema C on Nov 13, 2018
Richard D on Oct 31, 2018
Brian K on Oct 26, 2018
customer needs and ease of ordering
Chad M on Sep 28, 2018
This grease is recommended by motor manufacturers. We have used other grease in the past, and, after switching to Mobil Polyrex EM, we have had virtually no motor bearing failures.
Greg C on Sep 24, 2018
competitive pricing
nancy h on Sep 24, 2018
Electric motor manufacturer recommended.
Brandon S on Sep 14, 2018
Required by manufacturer.
Zach B on Sep 12, 2018
Very good price for a case of 10 tubes.
Angel S on Sep 12, 2018
needed for work
Lynn W on Aug 16, 2018
OMAR S on Aug 6, 2018
Top rated for electric motor/VFD systems.
Chuck C on Aug 6, 2018
Good Quality Grease for motors, been using for many years.
Masis Y on Jun 28, 2018
I work on electric motors and was told this is the best grease.
John L on Sep 11, 2019
It is what the blower calls for.
Robert M on Aug 28, 2019
what is the size of the box ?
A shopper on Jan 6, 2019
BEST ANSWER: One box of 10 cartridges (13.7 oz) is 12x12x5.
What volume (oz. / g) does the tube contain?
A shopper on Jul 10, 2018
BEST ANSWER: This is a 13.7 oz cartridge.