ECCPP Platinum Iridium Spark Plugs, 4-Pack

Pack: ECCPP Platinum Iridium Spark Plugs are listed as a four-piece replacement set, with the title naming Buick Rainier 4.2L/L6 fitment. The listing also gives a broader, different set of vehicle applications, so confirm the exact year, engine and replacement part number before ordering.

At a glance

Title identifies Buick Rainier 4.2L/L6, while the compatibility bullet names a different set of vehicles and engines.
Listing says these are direct-fit OEM-spec replacements and provides six reference part numbers.
The claimed iridium center electrode materials and listed gap and thread details may help buyers compare against the required plug specification.

Price

$11.00Save 30%

Reference price: ~~$15.72~~

Price checked: Nov 12, 2026

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Pros and cons

Pros

The listing provides several OEM reference numbers for checking replacement compatibility.
Four plugs are stated in the title, and the technical details include gap, reach, thread diameter and resistance.
The listing describes installation with a ratchet wrench and spark plug socket.

Technical specifications

13 specifications

Identity
Brand	ECCPP
Model	plugs

Plug specifications
Center electrode core material	Iridium
Gap size	0.039-0.043
Hex size	5/8 IN
Installation depth	53 MM
Reach	25MM
Resistance	5000
Thread diameter	14
OEM part numbers	91418, ILTR5E11, 12598004, 12622441, 12625058, 3474
Manufacturer part number	134413-5373-1104280441

Dimensions and installation
Dimensions listed	5.91 x 5.12 x 1.57 inches
Weight listed	8 ounces

What to know before buying

Listing details to confirm

Fitment details conflict: the title names Buick Rainier 4.2L/L6, while the compatibility text lists Chevy Malibu, Tahoe, Camaro and Suburban plus GMC Yukon applications, with no Rainier entry. Confirm the exact vehicle, engine and plug part number before purchase. The title claims four plugs, but no explicit package inventory is provided. The listing's performance, fit and installation-time claims are unconfirmed.

Who is it for?

A good fit for

Owners who can match the listed plug dimensions and OEM reference numbers to their vehicle's required part.
DIY vehicle owners looking for a spark-plug replacement and able to verify fitment first.

Less suited to

Buyers who need confirmed fitment for a particular vehicle without checking the application and part-number discrepancies.

ECCPP Platinum Iridium Spark Plugs, 4-Pack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 211 ratings

5 stars88%88%
4 stars6%6%
3 stars2%2%
2 stars0%0%
1 star4%4%

Aggregate ratings are predominantly five-star, though a smaller one-star portion shows that experiences are not uniformly positive. Without written customer feedback, the ratings do not identify specific strengths or problems. They cannot confirm vehicle fitment, so buyers should still match the listed part numbers to their application.

Frequently asked questions

Are these confirmed to fit a Buick Rainier 4.2L/L6?

The title names the Rainier, but the compatibility bullet lists other vehicles and does not name the Rainier. Verify the year, engine and required plug number before ordering.

How many plugs does the listing claim?

The title says 4PCS. There is no separate package inventory in the supplied listing details.

What OEM reference numbers are listed?

The listing gives 91418, ILTR5E11, 12598004, 12622441, 12625058 and 3474. Check that the applicable number matches your vehicle.

What gap does the listing specify?

It states a gap size of 0.039-0.043. Confirm the required gap for your engine before installation.