Best Spark Plugs For 2012 Nissan Altima

So, you're looking for the best spark plugs for your 2012 Nissan Altima? Good choice! Maintaining your ignition system is crucial for keeping your Altima running smoothly and efficiently. A worn or faulty spark plug can lead to a whole host of problems, from poor fuel economy to misfires and even engine damage. Let's break down what you need to know to make the right selection.

Understanding Spark Plug Problems in Your Altima

First, let's talk about why you might be looking to replace your spark plugs in the first place. Here are some common symptoms of worn or failing spark plugs in your 2012 Altima:

Reduced Fuel Economy: This is often one of the first signs. Old spark plugs don't ignite the fuel mixture as efficiently, leading to wasted gas.
Engine Misfires: A misfire feels like a momentary hesitation or stumble in the engine. You might notice it more during acceleration. The "Check Engine" light might also illuminate.
Rough Idling: If your Altima vibrates excessively or idles unevenly while stopped, bad spark plugs could be the culprit.
Difficulty Starting: Worn spark plugs can make it harder to start your car, especially in cold weather.
Loss of Power: You might notice a decrease in acceleration and overall performance.

Ignoring these symptoms can lead to more serious (and expensive!) issues down the road. Think of it this way: replacing spark plugs is a relatively inexpensive maintenance task compared to, say, replacing a catalytic converter damaged by unburnt fuel from misfires.

Choosing the Right Spark Plugs for Your 2012 Altima

Now, let's get down to the specifics of choosing the right spark plugs. The 2012 Nissan Altima came with either a 2.5L 4-cylinder engine or a 3.5L V6 engine. It's absolutely crucial to choose spark plugs that are compatible with your specific engine.

OEM vs. Aftermarket: What's the Difference?

You have two main options when selecting spark plugs: Original Equipment Manufacturer (OEM) plugs and aftermarket plugs.

OEM Spark Plugs: These are the plugs that Nissan originally installed in your Altima at the factory. They are designed to meet Nissan's exact specifications for performance and durability. In most cases for your 2012 Altima, these are likely going to be NGK or Denso brand plugs, but specifically packaged and sold through Nissan parts channels.
Aftermarket Spark Plugs: There are many aftermarket spark plug manufacturers, such as NGK, Denso, Bosch, and Autolite. Aftermarket plugs can offer similar (or sometimes even improved) performance compared to OEM plugs, and they may be more affordable.

Generally speaking, sticking with OEM-recommended or high-quality aftermarket plugs from reputable brands is the best approach. Don't skimp on quality here – cheap spark plugs can cause problems and may not last as long.

Spark Plug Types: Iridium, Platinum, and Copper

Spark plugs are made from different materials, each with its own advantages and disadvantages:

Iridium Spark Plugs: Iridium is a very hard and durable metal, making iridium spark plugs the longest-lasting option. They provide excellent performance and fuel efficiency. Iridium plugs are often the best choice for modern vehicles, and many 2012 Altimas came factory-equipped with them. Expect to pay a bit more upfront, but they'll last significantly longer (often 60,000-100,000 miles or more).
Platinum Spark Plugs: Platinum spark plugs are a step up from copper plugs in terms of durability and performance. They offer a longer lifespan than copper plugs and provide good fuel efficiency. They are often a good middle-ground option.
Copper Spark Plugs: Copper spark plugs are the least expensive option, but they also have the shortest lifespan. They require more frequent replacement (typically every 30,000 miles). While they offer excellent conductivity, their lower durability makes them less suitable for most modern vehicles. Generally, these are not recommended for your 2012 Altima unless you're looking for the absolute cheapest option and are prepared for more frequent replacements.

For your 2012 Altima, I strongly recommend using iridium spark plugs. They provide the best balance of performance, longevity, and fuel efficiency.

Recommended Spark Plugs for the 2012 Nissan Altima

Here are a few specific spark plug recommendations, keeping in mind that you should always verify the correct part number for your specific engine and trim level using an online parts catalog or your owner's manual:

For the 2.5L 4-Cylinder Engine:
- NGK Laser Iridium Spark Plugs (Part Number: DILKAR6A11) - These are often considered an OEM replacement.
- Denso Iridium Long Life Spark Plugs (Part Number: SK20HR11) - Another excellent option and a popular choice.
For the 3.5L V6 Engine:
- NGK Laser Iridium Spark Plugs (Part Number: PLFR5A-11) - A common and reliable choice.
- Denso Iridium Long Life Spark Plugs (Part Number: VK16) - Another solid option for the V6 engine.

Important Note: Always double-check the spark plug gap before installation. The correct gap is crucial for proper ignition. You can find the correct gap specification in your owner's manual or on a sticker under the hood. Use a spark plug gapping tool to adjust the gap if necessary. Many quality spark plugs come pre-gapped, but it's always a good idea to confirm.

Replacing Your Spark Plugs: DIY or Professional?

Replacing spark plugs is a relatively straightforward task for experienced DIY mechanics. However, if you're not comfortable working on your car, it's best to have a professional do it. Here's what you need to consider:

DIY Spark Plug Replacement

If you decide to tackle this project yourself, you'll need the following tools:

Spark Plug Socket: A special socket with a rubber insert to protect the spark plug.
Ratchet and Extension: To loosen and tighten the spark plugs.
Torque Wrench: To tighten the spark plugs to the correct torque specification (crucial to avoid damage).
Spark Plug Gapping Tool: To verify and adjust the spark plug gap.
Anti-Seize Lubricant: To apply a small amount to the spark plug threads to prevent them from seizing in the future.
Dielectric Grease: To apply to the spark plug boot to prevent corrosion and ensure a good electrical connection.
Gloves: To protect your hands.
Safety Glasses: To protect your eyes.

Important Safety Note: Always disconnect the negative battery cable before working on the ignition system. Work on a cool engine to avoid burns.

Professional Spark Plug Replacement

If you prefer to have a professional replace your spark plugs, the cost will vary depending on your location and the shop's labor rates. Generally, you can expect to pay somewhere in the range of $150 to $300 for a spark plug replacement on a 2012 Nissan Altima, including parts and labor. Call around to a few local shops to get quotes.

Long-Term Maintenance and Prevention

Once you've replaced your spark plugs, here are a few tips to keep your Altima running smoothly:

Follow the Recommended Maintenance Schedule: Refer to your owner's manual for the recommended spark plug replacement interval. Sticking to the schedule is crucial for optimal performance and fuel efficiency.
Use Quality Fuel: Using high-quality fuel can help prevent deposits from forming on the spark plugs.
Address Engine Issues Promptly: Any engine problems, such as misfires or rough idling, should be addressed as soon as possible to prevent further damage to the ignition system.

By choosing the right spark plugs and following a regular maintenance schedule, you can keep your 2012 Nissan Altima running reliably for years to come. Good luck!