Frequently asked questions
Get answers with our Mobil Delvac™ and Mobil Delvac 1™ frequently asked questions. You can filter questions by topic or product.
Product FAQs - Grease
For most applications, Mobil Delvac™ Xtreme Grease 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.
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.
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Fleet performance
Keep your trucks and your business going strong with the latest industry information, PC-11 oil recommendations and energy efficiency tips
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Mobil Delvac engine oils
Drivers and fleets around the globe rely on Mobil Delvac™ diesel engine oils – a recognized leader in heavy-duty lubricants for more than 90 years.
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Distributor locator
Use our locator tool to find out where to buy Mobil Delvac™ products in your area.
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The history of Mobil Delvac ™
For more than 90 years, Mobil Delvac diesel engine oil has continued to evolve through groundbreaking innovation. Discover the milestones that have kept the wheels of progress turning