Maintaining your equipment FAQs

Yes, ExxonMobil stands behind its products. Whether it’s our Mobil Delvac 1 advanced full synthetic engine oils, Mobil Delvac engine oils or ancillary products, we demonstrate our commitment to quality by offering limited warranties. 

For information on where you can purchase Mobil Delvac or Mobil Delvac 1 products, visit our “Where to buy” page. You can find an authorized distributor or truck services near you.

We have upgraded the formulations of all our Mobil Delvac 1 engine oils to meet or exceed the API CK-4 and FA-4 specifications, thereby offering outstanding all-around performance.

Click the “Contact us” button on this page (select “Fleets” from the “Topic*” drop-down menu) and a sales representative will contact you.

Regardless of whether you’re moving supplies in the frost of the Arctic, hauling trailers up and over mountains, or traveling in the heat of the desert, synthetic lubricants provide optimal protection in some of the harshest of driving conditions. Synthetic lubricants resist degradation at high temperatures better than conventional oils, leading to long oil life and reduced deposits, sludge, and varnish formation. At low temperatures, synthetic lubricants flow better than conventional oils, allowing them to reach components faster in order to provide quicker and better protection against wear. Because synthetic lubricants impart lower friction properties under load, they can help equipment operate more efficiently than conventional oils. This increased operational efficiency can be seen in improved fuel economy and lower operating temperatures, particularly in axle and transmission applications. In addition, many equipment builders endorse extended oil drain intervals when properly approved synthetic oils are used. In fact, many of world’s transmission and axle builders provide an extended warranty for those using approved synthetic lubricants in their equipment.

While an oil’s viscosity is an important characteristic, it actually does not say anything about an oil’s quality; neither does the oil’s color. To be sure you’re buying a quality oil, look at the bottle and ask yourself a few questions: Is the product a reputable brand such as Mobil Delvac™? Do the industry and original equipment manufacturer specifications listed meet the needs of my equipment? Am I buying the oil from a reputable store or distributor? Is there a way to make sure I am buying an authentic product? If you can answer yes to all of these questions, you know you are buying a quality product.

Mobil Delvac 1™ synthetic lubricants are fully compatible with their mineral oil counterparts, and it is practical to switch. The outstanding performance improvements of Mobil Delvac 1 synthetic products over mineral oils can be realized at all kinds of ambient temperatures. To realize these benefits, including improved efficiency and cost benefits, Mobil Delvac 1 products are recommended to use all year round.

Some people equate cheap oil with the inexpensive cost of operation. But this is a myth. The minute a piece of equipment is filled with an oil, the oil leaves its legacy behind. When comparing a premium product like Mobil Delvac™ to a cheap oil, the cheap oil could lead to higher wear rates and increased formation of deposit, varnish and sludge – all leading to high maintenance costs and reduced equipment life. So, while the cheap oil may cost less to buy, Mobil Delvac oil can cost less to own.

Mobil Delvac engine oils can help to extend the life of your engine. However, the actual life of an engine prior to overhaul depends on many variables: choice of oil, oil drain interval, maintenance practices, terrain traveled, driving habits, fuel quality, load carried and ambient temperature (to name just a few). But using Mobil Delvac oils will certainly help keep the engine life odds in your favor. 

While choosing a high-performing product like Mobil Delvac is a great step toward long equipment life, there are other key considerations. To begin with, you need a proper viscosity grade. A full synthetic 0W-20 product may provide significant fuel economy improvement, but it would most likely not run so well in a heavy-duty diesel engine. For that, a 5W-30 synthetic product is needed to provide protection against wear and maintain oil pressure. On the other hand, use of a 25W-60 in a modern, low emissions engine could also lead to premature engine failure since it may be too thick to properly lubricate all components, even at normal operating temperature. A proper preventive maintenance program is also critical to ensuring extended equipment life; this not only means that appropriate inspections, check-ups and work are done but also that they are done at the right interval.

Proper choice of oil, both in the engine and driveline, can have a impact on fuel economy. Two things to consider: A multigrade product tends to provide better fuel economy than a monograde (e.g., a 15W-40 is better than a 40 grade) and lower viscosity products tend to provide better fuel economy than higher viscosity products (e.g., a 5W-30 provides better fuel economy than both a 10W-30 and a 15W-40). As equipment ages, deposits and wear accumulate, resulting in a decrease in equipment efficiency. Mobil Delvac™ lubricants are able to protect the engine against deposit formation and wear, and resist soot-induced and oxidative viscosity thickening, allowing the equipment to maintain fuel economy throughout its life.

Mobil Delvac™ engine oils meet API and ACEA requirements for both gasoline as well as light-duty diesel engines, on top of its heavy-duty credentials. Mobil Delvac oils are formulated to protect a wide range of heavy diesel off-highway vehicles and equipment, including Class-8 big rigs, pickup trucks, diggers, excavators, dozers, graders, tractors, dump trucks and more.

Get all of the information you need by searching the SDS database or the PDS database. Safety Data Sheets (SDS), formerly known as Material Safety Data Sheets (MSDS), and Product Data Sheets (PDS) are important resources for manufacturers, fleets, fleet managers and owner/operators.

Mobil Delvac™ lubricants are formulated with a balanced additive system to provide outstanding performance for equipment. We invest millions of dollars testing our formulations to ensure this performance. Use of an aftermarket additive can easily throw this balance off, potentially causing severe problems. Additionally, many equipment builders now state in their service manuals that they specifically recommend against the use of these aftermarket additives. When you make a decision to purchase Mobil Delvac products, you can rest assured that they are formulated to provide optimal lubricating performance without any need for additional additives. 

Get all of the information you need by searching the SDS database or the PDS database. Safety Data Sheets (SDS), formerly known as Material Safety Data Sheets (MSDS), and Product Data Sheets (PDS) are important resources for manufacturers, fleets, fleet managers and owner/operators.

For most applications, Mobilgrease XHP 222 is recommended. It is a National Lubricating Grease Institute (NLGI) #2 lithium complex grease, designed specifically for use in severe on-road, heavy-duty trucking. It is particularly effective in rust protection. It also has sealing and tacky consistency in dry conditions, and its water-resistant capabilities help reduce lubricant consumption and increase bearing protection in wet environments. Most importantly, it offers very good rust and corrosion protection to help provide long life to bearings and chassis lube points.

Get all of the information you need by searching the SDS database or the PDS database. Safety Data Sheets (SDS), formerly known as Material Safety Data Sheets (MSDS), and Product Data Sheets (PDS) are important resources for manufacturers, fleets, fleet managers and owner/operators.

Changing oil performance standards are directly related to continuously evolving emissions and fuel economy regulations. In an effort to obtain cleaner air, the trucking industry must abide by these governmental regulations. That means they are constantly making design changes to their equipment, generally resulting in a harsher environment for the oil: higher temperatures, higher soot loads or even the need to be compatible with after-treatment systems. Bottom line? Low emission engines need higher performing products. Therefore, when emissions regulations change, so do oil specifications. Even if you have an older engine that does not meet the latest emissions standards, it still benefits from oils that are formulated to the latest standards.

Regardless of whether you’re moving supplies in the frost of the Arctic, hauling trailers up and over mountains, or traveling in the heat of the desert, synthetic lubricants provide optimal protection in some of the harshest of driving conditions. Synthetic lubricants resist degradation at high temperatures better than conventional oils, leading to long oil life and reduced deposits, sludge, and varnish formation. At low temperatures, synthetic lubricants flow better than conventional oils, allowing them to reach components faster in order to provide quicker and better protection against wear. Because synthetic lubricants impart lower friction properties under load, they can help equipment operate more efficiently than conventional oils. This increased operational efficiency can be seen in improved fuel economy and lower operating temperatures, particularly in axle and transmission applications. In addition, many equipment builders endorse extended oil drain intervals when properly approved synthetic oils are used. In fact, many of world’s transmission and axle builders provide an extended warranty for those using approved synthetic lubricants in their equipment.

During the winter, all vehicle lubricants – whether engine oil, transmission oil, differential oil, hydraulic oil or grease – should be considered. Before starting equipment in extremely cold temperatures, an operator should make sure the oils in the engine, transmission and hydraulic system are fluid enough to flow. Check the engine oils using the dipstick where applicable; other fluids should also be checked by their appropriate methods.

Many truck engines idle for very prolonged periods during cold winter temperature conditions to allow for warm-up and to keep the cab warm. Prolonged idling will reduce engine life and also waste fuel. Engines operate cooler while idling, and during long idle periods in winter's cold temperatures, moisture in the intake air can condense in the engine crankcase and produce corrosive sulfuric acid, which can attack soft bearing alloys. Long idling also contributes to increased soot and combustion contaminants, which will shorten the engine oil's life prematurely and can lead to excessive piston deposits, sludge formation and detrimental viscosity effects.

As temperatures drop, the same cold temperature viscosity phenomenon occurs with drivetrain lubricants as it does with engine oils. Following the engine warmup procedures mentioned above will also allow for sufficient oil circulation to your drivetrain components. For general-service transmissions used in on-highway Class 8 vehicles where ambient temperatures of -15 degrees Fahrenheit or below exist, a heat exchanger is recommended to make warm-up times faster. Fully synthetic SAE 50 transmission and SAE 75W-90 gear oil lubricants, such as Mobil Delvac 1™ Transmission Fluid 50 and Mobil Delvac 1™ Gear Oil 75W-90, will provide better low-temperature fluidity than conventional oils, as well as help reduce wear, leading to longer equipment life and allowing for easier gear shifting while operating cold.