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Dyna-Plex 21C products are in demand for on- and off-road fleets and equipment, industrial equipment, and metalworking and cutting applications. If you have a specific question or area of interest, the Dyna-Plex 21C team at PetroChoice, Inc. is ready to help. 

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Transmission Fluids

The Dyna-Plex 21C® line of transmission fluids includes solutions for automatic and manual transmissions.

All Dyna-Plex 21C products are formulated for exceptional all-weather performance and protection for heavy wear, and are particularly effective for bus fleets and over-the-road trucks for long transmission life.

Synthetic

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Dyna-Plex 21C® Synzol Heavy Duty Automatic Transmission Fluid

Dyna-Plex 21C Synzol Heavy Duty Automatic Transmission Fluid

Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Synzol Heavy Duty Automatic Transmission Fluid is a premium quality, synthetic lubricant used in heavy duty automatic transmissions. It is formulated with the quality level to support extended drain intervals, where applicable.

  • Excellent thermal and oxidative stability for long transmission life
  • Exceptional allweather performance in both hot and cold temperature extremes
  • Contains durable friction and is shear stable for longterm viscosity protection
  • Designed for heavy duty automatic transmissions in bus fleets and overthe-road trucks
Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Synzol Heavy Duty Automatic Transmission Fluid is a premium quality, synthetic lubricant used in heavy duty automatic transmissions. It is formulated with the quality level to support extended drain intervals, where applicable.

  • Excellent thermal and oxidative stability for long transmission life
  • Exceptional allweather performance in both hot and cold temperature extremes
  • Contains durable friction and is shear stable for longterm viscosity protection
  • Designed for heavy duty automatic transmissions in bus fleets and overthe-road trucks
Synzol Heavy Duty Automatic Transmission Fluid
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Dyna-Plex 21C® Synzol SAE 50 Transmission Oil

Dyna-Plex 21C Synzol SAE 50 Transmission Oil

Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Synzol Synthetic Manual Transmission Fluid is a full-synthetic fluid designed for today’s transmission synchronizers and formulated for years of trouble-free shifting. It is recommended for applications where heat and wear present major problems. These applications include manual transmissions where GL-1, GL-2, GL-3, and GL-4 type fluids are required.

  • Meets Eaton and Meritor 750,000mile extended warranty requirements
  • Allows 500,000 miles between drains in Eaton, Meritor and Mack transmissions
Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Synzol Synthetic Manual Transmission Fluid is a full-synthetic fluid designed for today’s transmission synchronizers and formulated for years of trouble-free shifting. It is recommended for applications where heat and wear present major problems. These applications include manual transmissions where GL-1, GL-2, GL-3, and GL-4 type fluids are required.

  • Meets Eaton and Meritor 750,000mile extended warranty requirements
  • Allows 500,000 miles between drains in Eaton, Meritor and Mack transmissions
Synzol SAE 50 Transmission Oil
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Dyna-Plex 21C® Extreme/Arctic TO-4 Transmission Oil

Dyna-Plex 21C Extreme/Arctic TO-4 Transmission Oil

Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C TO-4 Extreme Transmission Oil was designed to perform in both very cold and hot environments, eliminating the need for seasonal product changes for Caterpillar transmission and final drives. This product is designed with the latest additive technology for new Caterpillar machines and has been field tested to show an increase in transmission disc life up to 45%.

  • For power transmissions, clutches and brakes, final drives, bevel gears, differentials and other drive train components
  • Thermally stable chemical package provides oxidation and antiwear properties
  • Increases the life of bronze friction discs by demonstrating less slip
  • Increases the load carrying capacity of clutches above typical qualified engine oil
Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C TO-4 Extreme Transmission Oil was designed to perform in both very cold and hot environments, eliminating the need for seasonal product changes for Caterpillar transmission and final drives. This product is designed with the latest additive technology for new Caterpillar machines and has been field tested to show an increase in transmission disc life up to 45%.

  • For power transmissions, clutches and brakes, final drives, bevel gears, differentials and other drive train components
  • Thermally stable chemical package provides oxidation and antiwear properties
  • Increases the life of bronze friction discs by demonstrating less slip
  • Increases the load carrying capacity of clutches above typical qualified engine oil
Extreme/Arctic TO-4 Transmission Oil

Premium

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Dyna-Plex 21C Super Gear Oil

Dyna-Plex 21C Super Gear Oil

Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Super Gear Oil (SGO) is blended specifically for final drive and axle applications with high load and high temperature conditions. The product’s primary function is the protection of the gears and bearings in these extreme conditions. The lubricant is formulated for the Caterpillar final drives and axles that formerly required TO-4 oils and that do not contain friction materials. The oil does not develop the necessary friction to satisfy the requirements of most brakes and clutches.

  • Meets requirements of Caterpillar FD1
  • Excellent rust protection and copper corrosion protection
  • Capable of extending oil drain intervals and increasing oil life due to reduced oxidation rate
  • Compatible with TO4 oils and Caterpillar seal material and a suitable replacement for Caterpillar FDAO products
Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Super Gear Oil (SGO) is blended specifically for final drive and axle applications with high load and high temperature conditions. The product’s primary function is the protection of the gears and bearings in these extreme conditions. The lubricant is formulated for the Caterpillar final drives and axles that formerly required TO-4 oils and that do not contain friction materials. The oil does not develop the necessary friction to satisfy the requirements of most brakes and clutches.

  • Meets requirements of Caterpillar FD1
  • Excellent rust protection and copper corrosion protection
  • Capable of extending oil drain intervals and increasing oil life due to reduced oxidation rate
  • Compatible with TO4 oils and Caterpillar seal material and a suitable replacement for Caterpillar FDAO products
Super Gear Oil 50, 60
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Dyna-Plex 21C Premium Trac Gard

Dyna-Plex 21C Premium Trac Gard

Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Premium Trac Gard HD may be used in hydraulic systems alone, or in combination with hydraulic-transmission systems. It is recommended for most makes of tractors and has been formulated for better performance in axle lubricant applications. Dyna-Plex 21C Trac Gard HD is specially formulated to be oxidation and rust resistant. Gears and bearings are protected, even in extreme applications. Its multi-viscosity ensures superior pumpability at low start-up temperatures and provides excellent body at high operating temperatures.

Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Premium Trac Gard HD may be used in hydraulic systems alone, or in combination with hydraulic-transmission systems. It is recommended for most makes of tractors and has been formulated for better performance in axle lubricant applications. Dyna-Plex 21C Trac Gard HD is specially formulated to be oxidation and rust resistant. Gears and bearings are protected, even in extreme applications. Its multi-viscosity ensures superior pumpability at low start-up temperatures and provides excellent body at high operating temperatures.

Premium TRAC GARD

Conventional

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Dyna-Plex 21C TO-4 SAE 10W, 30, 50 Transmission Oil

Dyna-Plex 21C TO-4 SAE 10W, 30, 50 Transmission Oil

Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C TO-4 Transmission Oil was designed to enhance Caterpillar transmission and final drive life. This product is designed with the latest additive technology for new Caterpillar machines and has been field tested to show an increase in transmission disc life up to 45%.

  • For power shift transmissions, clutches and brakes, final drives, bevel gears, differentials and other drive train components
  • Thermally stable chemical package provides oxidation and antiwear properties
  • Increases the life of bronze friction discs by demonstrating less slip
  • Increases the load carrying capacity of clutches above typical qualified engine oil
Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C TO-4 Transmission Oil was designed to enhance Caterpillar transmission and final drive life. This product is designed with the latest additive technology for new Caterpillar machines and has been field tested to show an increase in transmission disc life up to 45%.

  • For power shift transmissions, clutches and brakes, final drives, bevel gears, differentials and other drive train components
  • Thermally stable chemical package provides oxidation and antiwear properties
  • Increases the life of bronze friction discs by demonstrating less slip
  • Increases the load carrying capacity of clutches above typical qualified engine oil
TO-4 SAE 10W, 30, 50 Transmission Oil
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Dyna-Plex 21C Trac Gard Hydraulic/Transmission Fluid

Dyna-Plex 21C Trac Gard Hydraulic/Transmission Fluid

Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Trac Gard Hydraulic/Transmission Fluid may be used in hydraulic systems alone, or in combination hydraulic transmission systems. It is recommended for most makes of tractors, using the latest additive technologies for outstanding performance.

  • Formulated to be oxidation and rust resistant
  • Protection for gears and bearings in extreme applications
  • Includes the highest quality inhibitor package available
  • Multiviscosity ensures superior pumpability at low start-up temperatures
  • Provides excellent body at high operating temperatures
Heavy-Duty On-Road, Heavy-Duty Off-Road

Dyna-Plex 21C Trac Gard Hydraulic/Transmission Fluid may be used in hydraulic systems alone, or in combination hydraulic transmission systems. It is recommended for most makes of tractors, using the latest additive technologies for outstanding performance.

  • Formulated to be oxidation and rust resistant
  • Protection for gears and bearings in extreme applications
  • Includes the highest quality inhibitor package available
  • Multiviscosity ensures superior pumpability at low start-up temperatures
  • Provides excellent body at high operating temperatures