(2 pack) Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oil 15W-40, 5 Gallon
(2 pack) Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oil 15W-40, 5 Gallon
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(2 pack) Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oil 15W-40, 5 Gallon

4.7 stars out of 1026 reviews
(4.7)|
1,026 ratings
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Key item features

  • Synthetic Formulation: This is a premium, full synthetic diesel engine oil designed to extend engine life for modern diesel engines operating in extreme conditions.
  • Extended Performance: Delivers extended performance, potentially up to two times beyond OEM recommended oil drain intervals.
  • Versatile Application: Recommended for a wide range of heavy-duty, on- and off-highway applications, including engines under heavy loads.
  • Engine Protection: Provides exceptional oxidation stability, anti-wear performance, and high-temperature protection for critical wear surfaces.
  • Cold Weather: Offers excellent low-temperature performance, ensuring increased oil flow at startup and smooth starting in cold weather.
  • Sludge Control: Helps control sludge formation and maintains stay-in-grade shear stability for consistent performance.
  • Broad Compatibility: Fully backward compatible, it performs excellently in both newer and older heavy-duty engines, meeting or exceeding API CK-4 and other service categories.
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Current price is $178.0013.9 ¢/fl oz
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This item includes:

  • 2-pack of Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oil 15W-40, 5 Gallon

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4.7 out of 5 stars
stars1,026 ratings254 reviews
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Showing 1-3 of 254 reviews

Mar 14, 2025
Sandy
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Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

I have been using mobile 1 for many years. It is a great oil, at a discounted price and in stock. My only problem when ordering is the default was on one gallon and kept giving me an error message saying this product would not work with the vehicle in my garage. Once I selected the 3 gallon option, it was fine.

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Helpful?8b98b530-0b0c-11f1-8e30-63e7131886fb17903667925
Feb 5, 2026
MALCOLM
Top Reviewer
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Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Protects and Runs smooth

I use this Mobil Delvac synthetic oil in a Toyota Land Cruiser Prado with a diesel engine 1KZ-TE. This oil is excellent and runs quite. I changed the oil and filter at 5,000 miles and the viscosity and color was normal. Mobil engineered a top tier synthetic diesel engine oil!

Helpful?8b98b530-0b0c-11f1-8e30-63e7131886fb17903667925
Mar 13, 2026
maykel
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Synthetic oil

The product works very well. I have tested it in my trucks with Cummins engines, and even at the 16,000-mile mark for an oil change, the old oil still retains excellent viscosity.

Helpful?8b98b530-0b0c-11f1-8e30-63e7131886fb17903667925