Bosch 6721 spark plug for the 1998-2001 Dodge Ram 1500 V6 3.9L or V8 5.2L, the 1998-2003 Ram 1500 V8 5.9L and other vehicles ignites the fuel and air in the cylinder. This Bosch spark plug is a fine wire platinum design and an upgrade from conventional copper core plugs. It requires up to 24% less voltage to ignite and gives up to 2 times longer life than standard copper spark plugs.
- Fine wire design with a platinum firing pin on the center electrode
- Pre-gapped from the factory, so the gap needs no adjusting
- Nickel-plated threads, so no anti-seize is required
- Tapered ground electrode that supports ignition throughout the plug's life
Quick facts
- Part: Bosch 6721 spark plug
- Fits: 1998-2001 Dodge Ram 1500 V6 3.9L or V8 5.2L, the 1998-2003 Ram 1500 V8 5.9L and other vehicles
- Condition: New
A worn plug can show up as a rough idle, a misfire or hard starting. Those signs can also come from other ignition or fuel parts, so with the engine cool, look at the removed plug's electrode and insulator for erosion, deposits or a cracked ceramic before you decide.
Fits
The vehicles it fits include the 1998 Jeep Grand Cherokee V8 5.2L or 5.9L and the 1998-1999 Dodge Durango V6 3.9L, the 1998-2000 Durango V8 5.2L and the 1998-2003 Durango V8 5.9L. The count depends on the engine: four plugs for L4-2.4L, six for V6-3.9L and eight for V8-5.2L and V8-5.9L, and this listing is one plug. For any other car, such as a Nissan or another Dodge model, look up your year and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: 4 (L4-2.4L), 6 (V6-3.9L), 8 (V8-5.2L and V8-5.9L)
- Package quantity: 1
- Gap: pre-gapped, no adjustment needed
Build and materials
- Type: fine wire platinum, 4-cycle
- Center electrode: platinum firing pin
- Ground electrode: tapered, nickel
- Threads: nickel plated
- Insulator type: projected
- Resistor: yes
- Condition: new
- Warranty: Bosch 4 year customer satisfaction guarantee and 1 year Technician Warranty
In the box
One spark plug.
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is Bosch 6721 the right Ram 1500 spark plug for a 1998-2003 Dodge Ram 1500 V8 5.9L?
Yes. The Bosch 6721 spark plug fits the 1998-2003 Dodge Ram 1500 V8 5.9L, which takes eight plugs, so you need eight of these listings.
Is this the Jeep Grand Cherokee spark plug for a 1998 Jeep Grand Cherokee V8 5.2L or 5.9L?
Yes. Bosch 6721 fits the 1998 Jeep Grand Cherokee with either the V8 5.2L or the V8 5.9L, and each of those engines takes eight plugs.
Is the 6721 one of the Bosch double iridium spark plugs?
No. Bosch 6721 is a fine wire platinum plug, with a platinum firing pin on the center electrode and a tapered nickel ground electrode.
Does this platinum spark plug come pre-gapped, or do I need anti-seize?
It arrives pre-gapped. Because the threads are nickel plated, anti-seize is not needed.
Does the 6721 have a built-in resistor?
Yes. The Bosch 6721 is a resistor spark plug with a projected insulator.
