When should Dodge Durango spark plugs be replaced?

The manual's maintenance plans list these spark plug items:

The manual's SRT servicing section says more frequent maintenance may be needed for vehicles in severe operating conditions, such as dusty areas and very short trip driving, and that inspection and service should also be done anytime a malfunction is suspected.

From the 2026 Dodge Durango owner's manual (Maintenance Plan - 3.6L and 5.7L Engines; Scheduled Servicing - SRT and its maintenance plan), read November 8, 2026.

Why the spark plug interval is mileage only

A footnote to the plan says the spark plug change interval is mileage based only, so the yearly (time) intervals in the table do not apply to spark plugs. In the SRT plan the footnote says monthly intervals do not apply. That means a Durango that is driven very little does not need new spark plugs just because of its age; the change is due when the odometer reaches the listed mileage.

From the 2026 Dodge Durango owner's manual (maintenance plan footnotes), read November 8, 2026.

Fuel and spark plug life

The manual's fuel section says gasoline blended with MMT (a manganese-containing additive used in some gasolines to raise octane) reduces spark plug life and reduces emissions system performance in some vehicles. The manufacturer recommends using gasoline without MMT, and because MMT content may not be shown on the pump, the manual says to ask the gasoline retailer whether the gasoline contains it. MMT is prohibited in Federal and California reformulated gasoline.

From the 2026 Dodge Durango owner's manual (Methylcyclopentadienyl Manganese Tricarbonyl (MMT) In Gasoline), read November 8, 2026.

Engine misfire and the catalytic converter

The manual's Exhaust System section says damage to the catalytic converter can result if your vehicle is not kept in proper operating condition. In the event of engine malfunction, particularly involving engine misfire or other apparent loss of performance, have your vehicle serviced promptly; continued operation with a severe malfunction could cause the converter to overheat, resulting in possible damage to the converter and vehicle.

It adds that it is important to keep the engine properly tuned to ensure proper catalyst operation and prevent possible catalyst damage.

From the 2026 Dodge Durango owner's manual (Exhaust System), read November 8, 2026.

Dodge Durango service at Elgin CDJR

If your Durango is due for spark plugs, or it runs rough or shows signs of a misfire, our Dodge service center handles the scheduled maintenance in your owner's manual and can check the engine. Our service department is open Monday to Friday 7 a.m. to 7 p.m. and Saturday 7:30 a.m. to 4 p.m., and is closed Sunday. Elgin CDJR is at 1500 W. Lake St. in Streamwood. Get directions.