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

4.7 stars out of 915 reviews
(4.7)|
915 ratings
Pack Size:Single
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Key item features

  • High Performance: Mobil Delvac Extreme 15W-40 is a premium full synthetic diesel engine oil designed for modern diesel engines in extreme conditions.
  • Extended Oil Life: Delivers performance for up to two times beyond OEM recommended oil drain intervals, depending on vehicle and conditions.
  • Versatile Use: Suitable for a wide range of heavy-duty, on- and off-highway applications, including engines under heavy loads.
  • Oxidation Stability: Provides exceptional oxidation stability, anti-wear performance, and high temperature performance.
  • Cold Weather Performance: Offers excellent low-temperature performance for increased oil flow at startup and controlling sludge formation.
  • Compatibility: Fully backward compatible, meeting or exceeding API CK-4, CJ-4, CI-4 PLUS, CI-4, and other service categories.
  • Engine Protection: Helps promote long life of critical wear surfaces with resistance to corrosive and abrasive wear.
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Current price is Now $89.00
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was $99.00
13.9 ¢/fl oz
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4.7 out of 5 stars
stars915 ratings243 reviews
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Showing 1-3 of 243 reviews

Mar 14, 2025
Sandy
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.

Incentivized Review
Helpful?8b98b530-0b0c-11f1-8e30-63e7131886fb327035382
Feb 5, 2026
MALCOLM
Top Reviewer
Item details
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-11f1-8e30-63e7131886fb327035382
Aug 1, 2025
Virgil
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Duramax Diesel Engine Oil

My truck holds 10 quarts when changing oil. This container helps make this task very simple utilizing the one and done method ultimately reducing needless waste if ordering individual quart containers. As for this Mobile product, it meets the ASE requirements for my engine.

Helpful?8b98b530-0b0c-11f1-8e30-63e7131886fb327035382