Diesel Exhaust Fluid (DEF)

If you drive a diesel vehicle, you may wonder when the Diesel Exhaust Fluid needs services. 

How DEF Level Service Works

Most modern diesel vehicles are equipped with Selective Catalytic Reduction (SCR) technology, which uses DEF to reduce Nitrogen Oxide (NOx) and Particulate Matter (PM) exhaust emissions from diesel engines. A liquid composed of 67.5% deionized water and 32.5% urea, DEF creates a chemical reaction in the catalytic converter that turns the NOx into water and nitrogen, significantly reducing NOx and PM emissions and slightly improving fuel economy. 

How to Check the DEF Level

You should always refer to your owner’s manual for instructions on how to check your vehicle’s DEF level. Most modern diesel engines allow you to check your DEF level by accessing your dashboard panel. You may also get a warning light on your dashboard that indicates low DEF levels.

How Often for Service

DEF service is dependent on many variables, including vehicle load, speed, distance driven, and idling time. Jiffy Lube^® recommends following manufacturer recommendations, where applicable, for maintenance schedules and service intervals.

Choose Your Local Jiffy Lube

Stop by your local Jiffy Lube^® for DEF services for your diesel vehicle. A trained technician will check and inspect your DEF tank for a low fluid level, then fill it up to an acceptable level to keep your diesel engine running clean. Our friendly, knowledgeable staff can also provide personalized advice based on your vehicle, such as how often you need to bring your vehicle in for DEF services. Plus, you can rest easy knowing we’ll service your diesel vehicle based on Original Equipment Manufacturer (OEM) recommendations.

Visit your local Jiffy Lube^® for DEF services to help regulate emissions from your vehicle’s diesel engine.

NOTE: Not all services are offered at all Jiffy Lube service centers. Please call ahead or check jiffylube.com to ensure the service is available at the Jiffy Lube location near you.