Mobil Delvac 1240 (Case of 4 - 1 Gal. Containers)

Mobil 104056

Mobil Delvac 1240 is a high performance, SAE 40, low sulfated ash diesel engine oil formulated to exceed the demands of a wide range of diesel engines. Mobil Delvac 1240 is especially formulated towards Detroit Diesel 2-cycle engines which require less than 1% sulfated ash. Mobil Delvac 1240 utilizes a select blend of base oils and balanced additives which control oxidation, deposits, and is especially effective on wear control in high speed, high temperature applications. Mobil Delvac 1240 is a preferred summer viscosity for many Detroit Diesel applications.

Case of 4x1
 - Available in a case of four 1 gallon (3.78 L) containers

Product Data Sheet

Features Advantages and Potential Benefits
Excellent oxidation and thermal stability Keeps engines clean and extends oil life
Good rust and corrosion prevention Long engine and component life

Recommended by ExxonMobil for use in:

  • Diesel powered equipment including 2-cycle applications
  • On highway light and heavy duty trucking
  • Off highway industries including: construction, mining, quarrying, and agriculture
Mobil Delvac 1240 is recommended by ExxonMobil for use in applications requiring: Mobil Delvac 1240
Mobil Delvac 1240
SAE Grade 40
Viscosity, ASTM D 445
cSt @ 40ºC 158
cSt @ 100ºC 15.5
Viscosity Index, ASTM D 2270 99
Sulfated Ash, wt%, ASTM D 874 0.8
Total Base # , mg KOH/g, ASTM D 2896 7.1
Pour Point, ºC, ASTM D 97 -21
Flash Point, ºC, ASTM D 92 247
Density @ 15ºC kg/l, ASTM D 4052 0.90
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Simple is the best oil for my Detroit diesel 1971 MCI bus
Elaine W on Apr 14, 2018
Simple is the best oil for my Detroit diesel 1971 MCI bus
Elaine W on Apr 14, 2018
Someone added delo 400 15-40 in my engine containing delvac 1240 will they work together?
A shopper on Jan 28, 2018
BEST ANSWER: It is compatible, however, it would depend on the ratio. Was it a couple quarts? If so, that would be no big deal but you will have more difficulty in colder weather because there is a viscosity difference between the two.