Name: 4 Pack ACDelco MR43LTS Spark Plug - For 1999-2014 Mercruiser 3.0L EST
Brand: TXN Supply Co
SKU: ACD-MR43LTS-4PK-MCM-30LEST99-FBM
Price: 22.77 USD
Availability: InStock
Rating: 5.0 (15 reviews)

Question 1

How do I find the right spark plug for my vehicle?

Accepted Answer

Use your vehicle's Year, Make, and Model along with engine size to find the correct plug. Every product listing includes compatibility information. If you're unsure, your vehicle's owner's manual will list the OEM spark plug part number, which you can use to cross-reference our catalog. You can also contact us at Contact Us and we'll help you find the right part.

Question 2

What's the difference between copper, platinum, and iridium spark plugs?

Accepted Answer

Copper: Best conductivity, lowest cost, shortest lifespan (~20,000–30,000 miles). Good for older vehicles or high-performance builds with frequent tune-ups. Platinum: Harder electrode, lasts ~60,000 miles. Standard upgrade for most modern vehicles. Iridium: Hardest material, finest electrode tip, best ignitability, longest life (~80,000–100,000+ miles). Best choice for most modern engines.

Question 3

Can I use aftermarket spark plugs instead of OEM?

Accepted Answer

Yes — in most cases, quality aftermarket plugs from NGK, Champion, ACDelco, or Autolite perform equal to or better than OEM. These brands supply original equipment to major automakers. Always match the heat range and electrode type recommended for your engine.

Question 4

How often should I change my spark plugs?

Accepted Answer

Copper plugs: every 20,000–30,000 miles. Platinum plugs: every 60,000 miles. Iridium plugs: every 80,000–100,000 miles. Check your owner's manual for your vehicle's specific interval. Symptoms of worn plugs include rough idle, misfires, reduced fuel economy, and hard starting.

Question 5

Do you offer free shipping?

Accepted Answer

Yes — all orders ship free , with no minimum purchase required. Free shipping applies to every order, every time.

Question 6

How long does shipping take?

Accepted Answer

Orders are processed within 1–2 business days. Standard delivery typically takes 3–7 business days after processing. You will receive a tracking number by email once your order ships.

Question 7

Do you ship internationally?

Accepted Answer

At this time we ship within the United States only.

Question 8

What is your return policy?

Accepted Answer

We accept returns within 30 days of delivery for unused items in original packaging. Customer-initiated returns have a 20% restocking fee , and the customer pays return shipping . Original outbound shipping is not refunded. To start a return, contact us at Contact Us with your order number. See our full Return Policy for details.

Question 9

What if I received the wrong item or a defective part?

Accepted Answer

Contact us immediately at Contact Us with your order number and a photo of the item. We will ship a replacement or issue a full refund at no additional cost to you.

Question 10

What brands do you carry?

Accepted Answer

We carry the industry's most trusted brands: NGK, Champion, ACDelco, Motorcraft, Autolite, Permatex, Lucas Oil, and ATP . Our catalog includes over 20,000 parts covering spark plugs, iridium plugs, oil filters, air filters, oxygen sensors, automotive chemicals, and more.

Question 11

Are your parts new or remanufactured?

Accepted Answer

All parts we sell are new — never remanufactured, rebuilt, or used. Every product ships from the original manufacturer's current production run.

Question 12

How do I know a part will fit my vehicle before I buy?

Accepted Answer

Each product listing includes vehicle compatibility details. If you have any doubts, email us at Contact Us before ordering. We'd rather confirm fitment upfront than process a return later.

Question 13

How do I reach customer support?

Accepted Answer

Email: Contact Us Phone: 512.850.6844 Address: 121 Spur 191, PO Box #242, Spicewood, TX 78669 We respond to all inquiries within 1 business day.

Customer Reviews

4 Pack ACDelco MR43LTS Spark Plug - For 1999-2014 Mercruiser 3.0L EST

Features & Benefits:

Specifications:

Customer Reviews

4 Pack ACDelco MR43LTS Spark Plug - For 1999-2014 Mercruiser 3.0L EST

Features & Benefits:

Specifications:

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