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Extreme Pressure Gear Oils

Product Code: SC

Call to Order

AMSOIL SG Series Extreme Pressure Gear Oils are long-life, extended drain premium gear oils. AMSOIL SG Oils incorporate the highest quality shear-stable, synthetic fluids, resulting in extended operational temperature ranges and superior hydrolytic stability and thermal oxidative resistance. AMSOIL Synthetic SG Series Extreme Pressure Gear Oils are the primary recommendation for gear applications requiring an extreme pressure lubricant. 

Data Sheet

Package sizes include:

  • 5-Gallon Pail
  • 55-Gallon Drum
  • 275-Gallon Tote

Allow two to four weeks for delivery.

Performance Features

  • Superior film strength, EP and antiwear protection

  • Outstanding thermal, oxidation and hydrolytic stability

  • Excellent demulsibility

  • Positive seal and petroleum oil compatibility

  • Excellent rust, corrosion and foam prevention

  • Excellent wear and shock loading protection

  • Extended oil drain intervals

  • Unbeatable cold-temperatur performance

Base Stock Technology

AMSOIL's SG Oils are compatible with mineral gear oils, synthetic gear oils*, and seals-making them easy to use. They preserve new seals, prevent leaks, and help rejuvenate old, brittle seals.

AMSOIL SG synthetic base stocks are inherently resistant to oxidation, helping provide long life. The naturally high viscosity indices, low pour points, and lack of paraffins (wax) make these lubricants ideal for use in wide operating temperature ranges. At low operating temperatures equipment starts easier, is not starved of lubrication from channeling and product solidification, and the need for sump heaters is reduced. At higher operating temperatures, AMSOIL SG base oils resist the degradative effects of oxidation that cause poor lubricant performance, and they maintain an optimal lubricating film between parts.

The base oils utilized are also hydrolytically stable and they readily separate from water. This prevents unwanted oil/water emulsions that have poor lubricating properties and it eases water removal from the sump. 

Additive Performance

AMSOIL SG Oils are fully formulated with sulphur/phosphorous extreme pressure additives, antioxidants, rust inhibitors, and anti-foam agents. The SG Oil's thermally stable, extreme-pressure additive system forms a hard, iron-sulfide coating on metal components. This iron-sulfide coating prevents metal to metal contact under boundary lubrication conditions, reduces friction and protects components against shock loading and wear. The anti-oxidants increase the oxidation resistance of the synthetic base oils for long, clean lubricant performance. These oils protect against rust from water or process contaminants and prevent foaming, ensuring proper lubrication.

Applications & Requirements

  • U.S. Steel 224

  • AGMA 250.04

  • AGMA 9005-D-94

  • DIN 51517 Part 3

  • David Brown ET 33/80, 51, 53 and 101

  • Cincinnati Milicron P-35, P-59, P-63, P-74, P-76, P-77 and P-78

Application Recommendation

AMSOIL Synthetic SG Series Extreme Pressure Gear Oils are recommended for industrial applications operating under heavy loads and shock conditions and specifying an extreme pressure lubricant. This includes, but is not limited to, enclosed industrial spur, bevel, herringbone, helical and worm gear**, chain drives, sprockets and most metal-on-metal systems requiring extreme pressure additives. These lubricants are excellent for use in severe operating conditions and their synthetic properties make them good all-season lubricants.

The SG Series Gear Oils meet the AGMA ratings for synthetic gear oils and EP gear oils and are recommended for use in applications specifying these standards. Although AMSOIL SG Series Oils are compatible with mineral oil based lubricants, for optimum performance it is recommended that the system be thoroughly drained and, if warranted, cleaned.

The ability of AMSOIL SG Series Gear Oils to extend drain intervals is subject to operating conditions and maintenance practices. Monitoring by oil analysis is recommended.


* AMSOIL SG Series Gear Oils, as well as other synthetic or mineral based oils, are not compatible with poly glycol-type gear oils. Thorough flushing prior to changeover is required.

** AMSOIL SG Series Gear Oils are not recommended for use in worm gear or yellow metal containing applications operating at or above 200°F (93°C). Also not recommended for use in other applications operating at or above 250°F (171°C). For such applications, please consult your AMSOIL Dealer or AMSOIL Inc.

AMSOIL SG Gear Oils are not recommended for automotive hypoid gear applications.

Typical Technical Properties
Synthetic SG Series Gear Oils SGH
ISO 32
ISO 46
ISO 68
ISO 100
ISO 150
AGMA EP Gear - - 2 EP 3 EP 4 EP
AGMA Synthetic Gear 0S 1S 2S 3S 4S
ISO VG - ASTM D-2422 32 46 68 100 150
VK 100°C - ASTM D-445 6.09 7.52 10.24 13.52 17.82
VK 40°C - ASTM D-445 33.50 44.75 68.85 100.79 149.78
Viscosity Index - ASTM D-2270 130 134 134 134 132
SPGR - ASTM D-1298 0.8443 0.8478 0.8534 0.8591 0.8654
Density - ASTM D-1298 7.031 7.060 7.107 7.155 7.207
Flash Point °C (°F) - ASTM D-92 256 (493) 256 (493) 260 (500) 246 (475) 248 (478)
Fire Point °C (°F) - ASTM D-92 272 (522) 272 (522) 284 (543) 276 (529) 282 (540)
Pour Point °C (°F) - ASTM D-97 -53 (-63) -53 (-63) -48 (-54) -45 (-49) -42 (-44)
Noack - DIN 51581 6.48% 5.77% 5.09% 5.41% 5.59%
Four-Ball Wear Test -
(40 kg, 1200 rpm, 75°C, 60 min.) ASTM D-4172 Mod.
0.45 0.43 0.43 0.41 0.35
Copper Strip Corrosion Test - ASTM D-130
121°C (250°F), 3 hrs.
1B 1B 1B 1B 1B
Timken OK Load, EP - ASTM D-2782 75 lbs. 75 lbs. 75 lbs. 75 lbs. 75 lbs.
Four-Ball EP ASTM D-2783 -
  Weld Point, Kg
  Load Wear Index, Kgf





FZG, Passed Stage ASTM D5182 12 12 12 12 12
Channel Point @ -40°C (-40°F) - FTM 3456.2 Non Channeling (All ISO Grades)


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