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frequently asked questions

  1. Is it true that the quality of an oil can be determined by its color or thickness (viscosity)?
  2. I’ve heard that as long as you change your oil regularly, it’s okay to buy the cheapest oil possible. Is this accurate?
  3. Can Mobil Delvac™ guarantee a certain amount of engine life without an overhaul?
  4. Beyond using Mobil Delvac is there anything else I can do to improve my equipment life?
  5. Does my engine oil impact my fuel economy?
  6. Why does it seem like every other year original equipment manufacturers or API/ACEA come out with new oil-performance standards?
  7. I’d like to use one grease for my truck. What should I look for?
  8. Can Mobil Delvac be used in more than just heavy-duty diesel engines?
  9. What’s the real story on supplemental oil treatments?
  10. Where and when should I use synthetic lubricants?
  11. Is it practical to switch to synthetic lubes after running mineral oils for a long time?
  12. What are the best practices for greasing intervals for fifth wheels?

 

1. Is it true that the quality of an oil can be determined by its color or thickness (viscosity)?
While an oil’s viscosity is an important characteristic, it actually does not say anything about an oil’s quality; nor does the oil’s color. To be sure you’re buying a quality oil just look at the bottle and ask yourself a few questions: Is the product a reputable brand like 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. >>back to top

2. I’ve heard that as long as you change your oil regularly, it’s okay to buy the cheapest oil possible. Is this accurate?
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 would 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 will cost less to own. >>back to top

3. Can Mobil Delvac guarantee a certain amount of engine life without an overhaul?
Mobil Delvac will help you achieve maximum engine-life performance. 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 will certainly help keep the engine-life odds in your favor.

Today, we see many of our successful trucking fleets and owner/operators able to successfully take their vehicles to one million miles or more before an overhaul thanks in part to Mobil Delvac and a commitment to proactive maintenance. >>back to top

4. Beyond using Mobil Delvac is there anything else I can do to improve my equipment life?
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. While a fully synthetic 0W-20 product may provide fantastic fuel economy, it won’t run so well in a heavy-duty diesel engine. For that, a 5W-40 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 at the right interval. >>back to top

5. Does my engine oil impact my fuel economy?
Proper choice of oil, both in the engine and driveline, can have a major impact on fuel economy. A few 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); lower viscosity products tend to provide better fuel economy than higher viscosity products (e.g., a 15W-40 provides better fuel economy than both a 20W-40 and a 15W-50). As equipment ages, deposits and wear accumulate, resulting in a decrease in equipment efficiency. Mobil Delvac is able to protect the engine against deposit formation and wear, allowing the equipment to maintain fuel economy throughout its life. >>back to top

6. Why does it seem like every other year original equipment manufacturers or API/ACEA come out with new oil-performance standards?
Changing oil performance standards are directly related to continuously evolving emissions regulations. In an effort to obtain cleaner air, the trucking industry must abide by these governmental regulations. So 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. Improved oil performance means improved engine protection for long engine life. And since oils meeting the newest specifications have better soot control and deposit protection, your engine will also get excellent protection against lost power, lost fuel economy, and increased oil consumption. >>back to top

7. I’d like to use one grease for my truck. What should I look for?
For most applications, Mobil Delvac™ Xtreme Grease is recommended. It is a National Lubricating Grease Institute (NLGI) #2 lithium complex, designed specifically for use in severe on-road, heavy-duty trucking. It is particularly effective in rust protection. It also has tenacious sealing, tacky consistency in dry conditions, and resists water and spray off. This all results in a longer-lasting grease — up to 50,000 miles in some long haul fleets. Most important, its corrosion resistance is among the best in the industry, providing rust protection against various chlorides used commonly in today’s road salts. >>back to top

8. Can Mobil Delvac be used in more than just heavy-duty diesel engines?
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, pick-up trucks, diggers, excavators, dozers, graders, tractors, dump trucks and more.

With their unique formulation, Mobil Delvac oils can help deliver performance beyond the boundaries of conventional oils because the composition includes Trimer Core chemistry, a powerful additive technology that resists oil degradation, reduces sludge buildup, and prevents wear — ultimately extending drain intervals and engine life.

  • That’s why the world’s five largest heavy-duty equipment manufacturers choose Mobil Delvac technology.
  • That’s why many of the nation’s leading truck stop chains choose to feature Mobil Delvac.

And that’s why Mobil Delvac™ 1300 Super is the only 15W-40 heavy-duty diesel engine oil selected by General Motors (GM) for its dealer oil program. >>back to top


9. What’s the real story on supplemental oil treatments?
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, you can rest assured that our products provide optimal lubricating performance without any need for additional additives. >>back to top

10. Where and when should I use synthetic lubricants?
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. Synthetic lubricants are also more efficient than conventional oils, leading to lower friction during operation. This lower friction 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 for an extended warranty for those using approved synthetic lubricants in their equipment. >>back to top

11. Is it practical to switch to synthetic lubes after running mineral oils for a long time?
Mobil Delvac synthetic lubricants are fully compatible with their mineral oil counterparts and it is practical to switch. The outstanding performance improvements of Mobil Delvac> 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 products are recommended to use all year round. >>back to top

12. What are the best practices for greasing intervals for fifth wheels?
Fifth wheel trailer mechanisms are subjected to a great deal of sliding and shock loading. Typically, fifth wheel surfaces should be coated with NLGI #2 grease before connecting the trailer. Since the existing grease on the surface has probably already collected dirt and other contamination, it should be cleaned before applying new grease.

Some fifth wheel mechanisms also contain a rack and pinion gear for positioning the trailer. These components often require special greases containing solids such as molybdenum disulfide or graphite so that the contact surfaces continue to be lubricated when the grease is squeezed out.

For most applications, we recommend Mobil Delvac Xtreme Grease. Mobil Delvac Xtreme Grease is a 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 tenacious sealing, tacky consistency in dry conditions, and resists water and spray off. This all results in a long-lasting grease — up to 50,000 miles in some long-haul fleets. Most important, its corrosion resistance is among the best in the industry, providing rust protection against various chlorides used commonly in today’s road salts. >>back to top