Rotella vs Delvac

Rotella Vs Delvac: Which One is Better?

Finding the perfect oil for your diesel engine is a difficult task when you have to choose which one is better; Mobil Delvac Extreme or Shell Rotella T6?

Since these two oil brands for considered the topmost choices among diesel vehicle owners. The battle of Rotella vs Delvac has been going on for a long as both claim to provide the best lubrication solutions for your diesel engine.

See our Related Guide about 9 Best Oil for Audi Q5 Engine.

Just like regular engines, diesel engines require proper maintenance, lubrication, cleaning, and protection of their components. These jobs demand heavy-duty and high-quality engine oils such as these two innovative oil brands.

Between them, there are multiple differences as well as similarities when it comes to fuel efficiency and overall performance. To help you make the best choice, we have put together a detailed comparison of Delvac oil vs Rotella.

Also See our Related Article On: Valvoline vs Mobil 1: Which One is the Best?

From distinct features of each oil brand to its merits and demerits, everything is listed here.

Rotella vs Delvac: Quick Overview

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
  • For best performance, follow the manufacturer's recommendations...
  • Provides 1. 5% improved fuel economy performance compared to SAE...
  • Triple Protection Plus formula combines fully synthetic base oils...
  • Formulated with additive technology that protects against the...
  • Engineered with shear stability to resist viscosity loss and...
Mobil Super 96819 15W-40 Delvac 1300 Motor Oil - 1 Gallon (Pack of 4)
  • Reduced oil consumption
  • Superior low-temperature sludge control in stop-and-go service
  • Outstanding control of high-temperature deposits and oil...
  • Reduced low temperature sludge build-up and high temperature...

Last update on 2023-11-29 / Affiliate links / Images from Amazon Product Advertising API

How to Choose Between Rotella And Delvac?

Mobil Delvac is an exclusive heavy-duty diesel engine oil, refined and made by Exxon Mobil Corporation, whereas, Shell Rotella is made for gasoline and diesel engines.

Mobil Delvac is an American brand, on the other hand, Shell Rotella is owned by the petroleum tycoon Shell Corporation.

Shell Rotella T5 Synthetic Blend 10W-30 Diesel Engine Oil (1-Gallon, Case of 3)
  • Synthetic blend 10W-30 diesel engine oil with Triple Protection...
  • Ideal for on-highway fleets, construction, and agricultural...
  • Formulated with advanced additive technology for enhanced deposit...
  • Fuel economy savings up to 2 percent compared to a conventional...
  • Provides better cold cranking properties and better low...

Last update on 2023-11-29 / Affiliate links / Images from Amazon Product Advertising API

While Delvac offers all three formulas; conventional, blend of synthetic, and fully synthetic, Rotella only offers fully synthetic and synthetic blends.

Mobil Delvac has beaten the CK-4 wear requirements by 50%, whereas the Shell Rotella has exceeded CK-4 requirements by 44%.

Product description 

Mobil Delvac

It is a top-quality diesel engine oil brand manufactured by an American multinational gas and oil corporation, named ExxonMobil Oil Corp.

It comes in a fully synthetic version with heavy-duty and high-performance characteristics. Mobil Delvac 15W40 is best known for offering long-lasting engine life to diesel engines with its innovative technology.

Delvac Mobil Mobil 15W-40 Heavy Duty Diesel Oil, 2.5 gal.
  • Oxidation performance superior to most conventional oils
  • Excellent anti-wear and anti-scuff properties
  • 2.5 gal Mobil Delvac oil offers extended drains beyond...
  • Excellent low-temperature performance allows oil flow to critical...
  • Stay-in-grade shear stability protects engine parts at high...

Last update on 2023-11-29 / Affiliate links / Images from Amazon Product Advertising API

It is formulated to add an extra layer of cleanliness and engine protection to the vehicles. This diesel engine oil is best suited for on-road heavy vehicles as well as constriction and mining purposes.

Mobil Delvac with its advanced features like thermal oxidation and corrosion resistance works best for the low emission diesel engines.

Shell Rotella 

It is one of the leading engine oil brands of the Dutch petroleum company; Shell. It is the best know for selling heavy-duty synthetic blends of diesel engine oils, with the latest petroleum technology.

The Rotella oil products use the special Triple Protection technology to enhance the engine performance and to increase its lifeline.

Shell Rotella 550049483-6PK T4 Triple Protection 15W-40 Diesel Engine Oil (CK-4), 1 Quart (Pack of 6)
  • For best performance, follow the manufacturer's recommendations...
  • Triple Protection from wear, deposits and oil breakdown, this...
  • Formulated with advanced additive technology, which is engineered...
  • Provides increased shear stability for better viscosity control...
  • Heightens emission control system durability and improves oil...

Last update on 2023-11-30 / Affiliate links / Images from Amazon Product Advertising API

Shell Rotella diesel engine oil offers fully synthetic versions along with the synthetic blend made entirely from the authentic base oils.

It uses protection additives to secure the diesel engines against the wear and tear of the road and enhancing the overall performance.


The competition between Mobil Delvac 15w40 vs Rotella 15w40 is ever-growing as both of these oil brands have distinct specifications that keep on improving.

Mobil Delvac

  • Name of the Brand: Mobil Delvac
  • Origin: USA
  • Type: Conventional Formula, Fully Synthetic, Synthetic Blend Formula, Advanced synthetic formula
  • Suitable Engines: Diesel
  • Volume: 1 Gallon, 1 Quart
  • Labels: Mobil Delvac 1300 Super, Mobil Delvac 1, Mobil Delvac 1 ESP
  • Mileage Lasting: 100,000-500,000 miles
  • Canister: Plastic
  • Viscosity: SAE 5W-30, 15W-40, 10W-30, 5W-40
  • Product Approvals/ Recommendations: Mack EO-N, Renault Trucks RLD-2, MTU Oil Category 2, Volvo VDS -3, API SH, Cummins CES 20071, API CF -4

Shell Rotella

  • Name of the Brand: Shell Rotella
  • Origin: Dutch
  • Type: Fully Synthetic (Shell Rotella T6), Synthetic Blend (Rotella T5).
  • Suitable Engines: Diesel, gasoline, and heavy-duty engines
  • Volume: 1 US Gallon
  • Labels: Shell Rotella T6, Shell Rotella T5, Shell Rotella T4
  • Mileage Lasting: Nearly 500,000 miles.
  • Canister: Plastic
  • Viscosity: SAE 15W-40, 5W-40, 10W-30
  • Product Approvals/ Recommendations: Ford WSS-M2C171 -F1, JASO DH-2, Cummins CES 20086, Allison TES 439, Volvo VDS -4.5


Here are some common features of both brands that help us choose between Shell Rotella T6 and Mobil Delvac 1:

Mobil Delvac

  • Mobil Delvac One or Delvac 1300 Super is compatible with a wide range of diesel engines, for on and off-roading.
  • With the higher temperature technology, it offers protection from excess heat in large and heavy-duty diesel trucks.
  • It fulfills OEM recommendations for nearly every manufacturer, even those whose requirements cannot be found anywhere else.
  • All labels of Mobil Delvac offer improved engine oil performance in heavy-duty vehicles due to the enhanced oxidation and thermal stability.
  • This diesel oil has an outstanding fuel economy that withstands even below zero temperatures in harsh weather conditions.
  • It comes with improved soot handling and wear protection technology that controls the viscosity of the engine oil.

Shell Rotella

  • It offers several different formulas with distinct oil versions such as T6, T5, which work best for trucks.
  • All of the advanced formulas of Shell Rotella are based on the authentic oil base using Triple Protection Technology.
  • It protects the engine components by its additives, which are for soot and dirt removal, and for cleaning the oil.
  • It has improved low-temperature properties that enable it to protect the engine from wear and tear in extremely cold weather such as -13C.
  • Shell Rotella is known for its 80%-90% improved protection from lead and copper corrosion, during the process of ignition.


Mobil Delvac

  • Fair price: Most labels of the Mobil Delvac offer great value for money, considering the higher characteristics they have.
  • Cleaner and long-lasting engine life: The advanced technology of Mobil Delvac keeps the engine components cleaner by preventing deposits formation, and increasing their life.
  • Extra-ordinary performance in old engines: It is the best solution for aged diesel trucks due to its corrosion protection and better performance.
  • Greater fuel economy: The fuel economy is increased to a large extent by the constant usage of this oil in heavy-duty vehicles, which is a plus point for drivers.

Shell Rotella

  • Upgraded oil pressure: The oil pressure of the vehicle is upgraded by the Shell Rotella both in steady or moving positions.
  • Excellent engine performance: With the creative soot handling and the dirt removal formulas, the overall engine performance is enhanced multi-folds.
  • Improved fuel efficiency: This diesel engine oil is known to improve fuel efficiency and economy by up to 1.5 %, which holds a greater significance for heavy trucks.
  • Better flow in low temperature: Shell Rotella remains steady in its performance and engine efficiency even during extremely low temperatures.

Customer Reviews

Mobil Delvac 

My husband gets this oil for our diesel truck. Amazing price and product.”

“This engine oil is a synthetic blend and tolerates heat better than any other regular diesel oil.”

“The best diesel oil in the market and that too at this price.”

Shell Rotella

“Rotela is the only motor oil I have ever used in my truck and it will be the only oil I will use in the future.”

“This oil was suggested by my mechanic who is pretty specific now I recommend it too.”

“Greatest oil for all diesel engines. I use it for my farm tractor and semi-truck.”

Recommended Reading:


1. Is Mobil Delvac good oil? 

Yes, Mobil Delvac with its various advanced formulas is one of the best heavy-duty diesel motor oil. With its enhanced fuel economy, innovative soot removal, extended engine life, and reasonable prices.

it is considered a very good oil, among truck drivers.

2. Is Mobil Delvac synthetic oil?

Yes, Mobil Delvac is a fully synthetic high-performance diesel engine oil, that is best suited for low emission vehicles.

It also comes in the conventional formula as well as in blends of synthetic formulas, according to the need and properties of the engine.

3. What is the difference between Delvac and Rotella?

The biggest difference between Delvac and Rotella is that Rotella offers oil products for both diesel and gasoline vehicles, whereas, Delvac is committed only to diesel engines.

Also, the Mobil Delvac is owned and manufactured by an American oil company, while, Shell is a Dutch company with foreign subsidiaries.

4. Who makes Delvac oil?

Delvac diesel engine oil is made and owned by ExxonMobil, which is America’s one of the biggest oil and gas corporations. All of the Mobil Delvac oil products are refined, manufactured, and tested in Texas, USA.

5. Is Mobil Delvac 15W40 synthetic?

Yes, Mobil Delvac 15W40 is a fully synthetic diesel oil with modern technology for increasing the engine life and offering greater corrosion protection.

With its synthetic formula, Delvac provides a steady flow of oil during lower than zero temperatures and keeps the engine running.


Both of these diesel engine oils have unique properties and innovative solutions for heavy vehicles, whether it’s Shell Rotella T6 vs Mobil Delvac 1 or any other label.

The comparison between the two is never-ending since both have quite similar characteristics and each beats the other in some feature.

For example, Shell Rotella oil products can be used for both gasoline and diesel engines, unlike Delvac, but Mobil Delvac is comparatively pocket-friendly.

With all the information, we conclude that Mobil Delvac is a better option if you are looking for an efficient diesel engine oil for your heavy vehicle.

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