There is no Honda product officially named “urea grease.” Urea-based fluids are used in some Honda vehicles as Diesel Exhaust Fluid (DEF) to reduce NOx emissions, while grease serves as a lubricant for moving parts. These are distinct substances with different purposes and are not interchangeable. This article explains what urea is used for in Honda vehicles, what the term might refer to, and how to handle labeling or claims you may encounter.
In common automotive language, “urea” refers to the chemical used in DEF, not a lubricant. Some aftermarket labels may imply a product called “urea grease,” but that would typically be a mislabel or misunderstanding. The following sections separate fact from rumor and offer practical guidance for owners and technicians.
Urea in Honda vehicles: the emissions story
In diesel applications, Honda uses a selective catalytic reduction (SCR) system that relies on a urea-based solution to neutralize NOx emissions. The solution, commonly referred to as Diesel Exhaust Fluid (DEF), is injected into the exhaust stream where it reacts with catalysts to form nitrogen and water. DEF is not used in gasoline or hybrid Honda vehicles; only diesel-equipped models in markets where they’re sold require DEF.
Before examining the specifics, here are the core facts about urea-based DEF in Honda vehicles and how it differs from lubricants.
- DEF is a urea-water solution (typically around 32.5% urea) used in diesel engines to reduce nitrogen oxides (NOx) via selective catalytic reduction (SCR).
- It is not a lubricant and should not be used as grease or applied to engine bearings, gears, or other moving parts.
- DEF is stored in a dedicated reservoir and must remain uncontaminated; it freezes at low temperatures and will thaw after warming, but contaminated or past-sell-by-date DEF should be replaced.
- When a vehicle equipped with a diesel engine approaches a DEF depletion or quality issue, a warning will appear and the DEF system should be refilled with a product that meets ISO 22241 standards.
- In markets where Honda does not sell diesel vehicles, DEF is not required; gasoline and hybrid models do not use DEF.
Ultimately, DEF’s purpose is emissions control, not lubrication. It is a separate system from engine oil and grease, and it should never be used as a substitute for lubrication.
Key distinctions between urea-based fluids and grease
Urea-based DEF and grease serve fundamentally different roles in a vehicle. DEF is a chemical solution designed for NOx reduction in diesel exhaust, while grease is a lubricant applied to bearings, joints, and other moving parts. They are stored and handled differently and have separate maintenance schedules. Always follow the vehicle’s owner manual and the lubricant/DEF specifications set forth by Honda.
Is there a Honda product officially named “urea grease”?
No. Honda does not publish a product in its official catalogs or service literature under the name “urea grease.” If you encounter labeling or packaging claiming such a product, it is likely a mislabel, misunderstanding, or an aftermarket claim rather than an official Honda item.
When you come across a product marketed as “Honda urea grease,” use caution and verify its authenticity before use. Here is how to proceed if you encounter such labeling.
Before considering a list of steps, note that the following guidance helps ensure you’re using the correct products for emissions control and lubrication.
- Check the label and part number against Honda’s official parts catalogs or your dealer’s database to confirm legitimacy.
- Contact your Honda dealer or Honda Customer Relations to verify whether the product is appropriate and compatible with your specific vehicle model and market.
- Do not apply any product labeled as “urea grease” to the engine or emissions system unless it is confirmed by Honda to be suitable. Use only Honda-recommended lubricants and DEF from reputable sources.
- If you purchased a mislabelled product, inquire about returns or exchanges through the retailer, and report concerns to the manufacturer if needed.
By sticking to official Honda-approved products, owners can avoid damage to emissions equipment or lubrication systems and ensure peak performance and compliance with local regulations.
Summary
In short, “Honda urea grease” is not a standard or official Honda product. Urea is used in Diesel Exhaust Fluid for NOx reduction in diesel engines, while grease is a lubricant for moving parts. They serve different purposes and are not interchangeable. If you encounter a product labeled as such, verify its authenticity with Honda or your dealer, and rely on Honda-recommended lubricants and DEF that meet established standards. When in doubt, consult the vehicle’s manual or contact Honda Customer Relations for guidance.