Mobil Delvac EL 50/50 AF (55 Gal. Drum)

Mobil 103126

Mobil Delvac Extended Life 50/50 Prediluted Coolant/Antifreeze is ready to use as soon as it arrives. It provides excellent protection for all cooling system metals, using organic corrosion inhibitors that protect cooling systems for 1,000,000 miles of on-road use (8 years or 20,000 hours of off-highway use). Since the organic corrosion inhibitors don't easily deplete, there is no need for Supplemental Coolant Additives that are required when using conventional coolants. Mobil Delvac Extended Life 50/50 Prediluted Coolant/Antifreeze is phosphate-free, silicate-free, nitrite-free and borate-free, and it has an ethylene glycol base.

Product Data Sheet

  • Long Service Life: 1,000,000 miles of on-road use (8 years or 20,000 hours of off-highway use)
  • Designed for use in engines running EGR and SCR technologies that can increase cooling system temperatures
  • Eliminates the cost of SCAs, test strips and manpower required to test the coolant and add SCAs
  • Can accept up to 25% mixing with conventional coolant technologies, with no detrimental effect to corrosion protection or reducing the extended life properties
  • Fully compatible with other quality Organic Acid (OAT) and Nitrited Organic Acid (NOAT) heavy-duty extended life coolants
  • Non­abrasive formula can improve water pump seal life
  • Optimal hard water compatibility and reduced hard water scale
  • Provides outstanding long-term elastomer compatibility

Mobil Delvac Extended Life 50/50 Prediluted Coolant/Antifreeze is recommended by ExxonMobil for use in: 

  • All types of heavy-duty diesel, gasoline and natural gas engines.
  • Stationary engine applications regardless of fuel type being used.
  • Marine cooling systems where freeze protection is needed.
  • Mixed fleets where both light-duty and heavy-duty trucks are present.


To assure success using Mobil Delvac Extended Life 50/50, the system should be drained and flushed. Mobil Delvac Extended Life 50/50 is a ready to use product. To insure the proper concentration level of the inhibitors and boil-over/freeze protection, do not add water or mix with other unknown coolants.

With Mobil Delvac Extended Life 50/50 there is no need to use an initial charge of supplemental coolant additive or pre-charge spin on water filter.
Mobil Delvac Extended Life 50/50 is compatible with other ELC and conventional heavy duty coolants. Dilution with conventional coolants will reduce extended life benefits.

Mobil Delvac Extended Life 50/50 a new patented technology OAT – ELC + Nitrites – Molybdates, provides extended life protection that ensures performance to 1.000.000 km (600.000 miles) or 12.000 hours when refill is done with the same Mobil Delvac Extended Life 50/50.

Mobil Delvac™ Extended Life Coolant/Antifreeze is recommended by ExxonMobil for use in applications requiring:  
ASTM D 6210 X
Detroit Fluid Specification 93K217 X
ASTM D 7583 X
MTU 5048 X
Behr Radiator X
John Deere H24A2, H24C2 X
Navistar CEMS­-B1-­Type IIIa X
Cummins CES 14603 X
MAN 324 Type SNF X
TMC RP 329 X
MB-Approval 326.3 X


Meets the performance requirements of:
Phosphate­-free requirements of European original equipment manufacturers (OEMs)
Silicate­-free requirements of Japanese OEMs


Protection Table





Freezing Down To

Boiling Up To*


­- 37 °C / - ­34°F

129 °C / 265 °F

*Using a 15 PSI Pressure Cap




ASTM Test Method

Typical Values For Mobil Delvac 50/50 Prediluted Coolant/Antifreeze

Specific Gravity (60/60˚F)


1.070 – 1.090

Freezing Point, 50 Vol. %, ˚F

D3321 or D1177

­- 34˚F

Boiling Point, 50 Vol. %, ˚F



pH, 50% Volume Solution


8.0 – 9.0

Reserve Alkalinity, mL


3.8 – 5.0

Foam Test


150 ml. / 5 sec., Max




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