DEF near me — frequently asked questions

Question 1

Where can I find DEF near me right now?

Accepted Answer

Roadside Oasis has DEF at the pump at all five Inland Empire truck stops: Moreno Valley (22310 Cactus Ave, off SR-60); Menifee (27503 McCall Blvd, off I-215); Calimesa (727 W County Line Rd, off I-10); Rialto (1875 N Alder Ave, off I-210 / I-10); San Jacinto (250 N Sanderson Ave, off SR-79). Every one is open 24 hours a day, every day.

Question 2

What is DEF and why does my truck need it?

Accepted Answer

Diesel exhaust fluid is a urea and deionized water solution injected into the exhaust stream of trucks with selective catalytic reduction (SCR) systems. It converts nitrogen oxides into nitrogen and water vapor so the engine meets EPA emissions standards. If the DEF tank runs dry, most engines derate to a crawl speed until it is refilled.

Question 3

Is DEF at the pump cheaper than DEF jugs?

Accepted Answer

Buying DEF at the pump is almost always cheaper per gallon than 2.5-gallon jugs, and it is faster — you fill directly from the dispenser at the truck fuel canopy instead of hauling and pouring containers. Every Roadside Oasis canopy dispenses DEF at the pump.

Question 4

How much DEF does a semi truck use?

Accepted Answer

Most modern Class 8 trucks consume DEF at roughly 2 to 3 percent of diesel consumption. On a 100-gallon diesel fill that is about 2 to 3 gallons of DEF, so topping off DEF each time you fuel keeps the tank from ever running low.

Question 5

Do I earn rewards points on DEF purchases?

Accepted Answer

Yes. Earn 10 points per gallon on Pro Driver Diesel and DEF at the truck fuel canopy. 500 points equals $5.00 toward purchases inside the convenience store.

Question 6

Is DEF available 24 hours?

Accepted Answer

Yes. Every Roadside Oasis location is open 24 hours a day, seven days a week, including weekends and holidays. DEF at the pump and the convenience store are available whenever you roll through.

Question 7

Can I pay for DEF with a fleet card?

Accepted Answer

Yes. Roadside Oasis accepts Comdata, Fuelman, Multi Service Fuel Card, Fleet One and EFS, along with cash and debit or credit cards. CFN is accepted as a payment method but is not part of the rewards program.

Question 8

Does DEF go bad?

Accepted Answer

DEF has a shelf life of roughly one to two years when stored between 12°F and 86°F, and it degrades faster in sustained heat or direct sunlight. Buying DEF at the pump as you need it — rather than storing jugs in an Inland Empire summer — keeps the fluid within spec.

	DEF at the pump	DEF in jugs
Cost per gallon	Lowest — bulk dispensed	Highest — packaging included
Time to fill	Seconds, at the canopy	Carry, cut, pour, dispose
Spill risk	Sealed nozzle	Pouring by hand
Freshness	Bulk tank, turned over daily	Degrades in heat and sunlight
Waste	None	Empty containers every fill
Earns points	Yes — 10 per gallon	Store purchase rules apply

DEF at the pump, 24 hours, across the Inland Empire

Where to get DEF near you

DEF in Moreno Valley, CA

DEF in Menifee, CA

DEF in Calimesa, CA

DEF in Rialto, CA

DEF in San Jacinto, CA

What DEF is and why it matters

A urea solution, not a fuel additive

Roughly 2–3% of diesel burned

Run dry and the engine derates

Pump DEF beats jug DEF

Turn your fill-up into lunch

DEF near me — questions drivers ask

DEF and diesel by nearby city