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NGK Spark Plug
NGK Spark Plug 4095

NGK Spark Plug 4095

4.9· 710 ratings

Last price we saw

$10.22last seen Oct 29

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Our take on the NGK Spark Plug 4095

The NGK 4095 (IZFR6F11) is a single iridium spark plug with a 14 mm thread, 19 mm reach and a 0.043 in (1.1 mm) gap. It uses a fine-wire iridium center electrode, a copper core and a 5k ohm resistor, and NGK lists it as the match for vehicles that came with OE fine-wire iridium plugs. It is a one-plug purchase, so a full engine set means buying several. Pricing varies by seller; check the current quote against its recent range before ordering.

Best forOwners replacing OE iridium plugs on the listed applicationsDistributorless ignition systemsSport-touring and daily-driven carsBuyers who want the exact OEM part number IZFR6F11
Pros
  • Fine-wire iridium tip resists wear better than standard nickel plugs
  • Copper core and 5k ohm resistor suit distributorless ignition
  • Trivalent metal plating helps against corrosion
  • Pre-gapped at 0.043 in (1.1 mm)
  • Cross-references directly to OEM IZFR6F11
Cons
  • Sold as a single plug, not a set
  • Iridium plugs cost more than standard plugs
  • Must match heat range 6 and 19 mm reach; wrong fit damages an engine
  • Gap should still be checked before install

NGK Spark Plug 4095 price history

Lowest price we've seen: $10.22 on Oct 29. Tracked across 1 store since Oct 29.

What reviewers say

Rated 4.9 out of 5 from 710 ratings. Owners report smooth idle and easy starts after swapping in these plugs, and many note they match the factory plug exactly.

Pros
  • Smooth idle and clean running
  • Exact OE replacement fit
  • Long service life
  • Good value for an iridium plug
Cons
  • Single-plug packaging means buying several
  • Price higher than standard plugs

Specifications

Material
Copper core, Trivalent metal plating
Ignition Type
Distributorless ignition systems
Spark Gap
.043" (1.1mm)
Voltage
Reduces voltage requirement
Resistance
5k Ohm (Resistor Value)
Trim
Sport Touring
Length
4.02 IN
Height
ISO (overall height)
Width
0.9 INH
Diameter
14 mm (Thread)
Weight
0.1 LBR
Insulation Material
Pure alumina silicate ceramic insulator
Spark Plug Type
Iridium
Number Of Spark Plugs
1
Wire Resistance
5k Ohm
Heat Range
6
Reach
19mm (3/4")
Thread Size
1.25 mm (pitch)
Ground Electrode Count
1
Hex Size
5/8" (16mm)

Questions and answers

Is the NGK 4095 worth it over a standard plug?
If your car came with iridium plugs, yes. The fine-wire iridium tip lasts longer and holds its gap better than a nickel plug, and this one matches OEM part IZFR6F11.
How many plugs do I need?
One per cylinder. This listing is a single plug, so a four-cylinder engine needs four and a V6 needs six.
What gap does it come with?
It is set at 0.043 in (1.1 mm). Check the gap against your owner's manual before installing, since it can shift in shipping.
Will it fit my car?
Only if your engine takes a 14 mm thread, 19 mm reach and heat range 6, and originally used IZFR6F11. Confirm by the OEM number or your owner's manual.
When is it cheapest?
Multi-pack listings usually beat single-plug prices per unit. Compare the current quote with its recent range before buying.
What do buyers say about the NGK Spark Plug 4095?
Rated 4.9 out of 5 from 710 ratings.