Spark plug Bosch or Denso

PartReview Score

Rank #3 in ranking

198

145

264

3.3

Acceleration

3.0

Idle

3.2

Starting

3.0

Owners' choice:

PR Score

Ranking

Votes

Reviews

Average rating

Properties

Car

PartReview Score

Rank #2 in ranking

324

137

184

3.9

Acceleration

3.7

Idle

3.8

Starting

3.8

No data

Reviews

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Bosch

Denso

Denso › Spark plug

Malonehasbadbreath 24 Nov 2025, 15:05

Idle:

Rating 5.0

Denso 3289 is what I run.

398k on the clock, like 50k on these plugs, she runs clean and smooth.

Pros: runs clean and smooth

Mileage: 50000 km

Part number: 3289

Bosch › Spark plug

Juniorslothsix 24 Nov 2025, 13:41

Starting:
Acceleration:

Rating 5.0

I just picked up 6 Bosch dual electrode double iridium spark plugs from autozone near me and threw them in. Fires great!

Pros: fires great

Denso › Spark plug

krongalong 24 Nov 2025, 06:25

Rating 5.0

Denso for my runner

Vehicle: Toyota 4runner

Bosch › Spark plug

retrobologna 23 Nov 2025, 20:37

Idle:

Rating 4.0

I used the gimmicky Bosch Platinum 4+ plugs which solved that problem (no more CELs) but sometimes idle is still a bit rough.

Pros: solved CEL problem

Cons: idle still a bit rough

Vehicle: Ford

Denso › Spark plug

Dctr_K 23 Nov 2025, 16:11

Rating 5.0

Denso or NGK. Buy them from a real vendor not eBay or Amazon or anything like that

Denso › Spark plug

hobo_squared 22 Feb 2025, 19:14

Rating 3.0

I replaced the plugs with DENSO 5358 roughly 10K miles ago.

Mileage: 16093 km

Part number: 5358

Bosch › Spark plug

tuenbabz 31 Jan 2025, 07:54

Acceleration:

Rating 3.0

I also added bosch sparkplugs 4 months ago, and also have some stuttering.

Cons: some stuttering

Bosch › Spark plug

SlowHornet29 24 Jul 2025, 19:28

Acceleration:

Rating 2.0

I put the expensive double spark, spark plugs into a Mitsubishi galant one time. Plugs were supposed to be hotter and make the car run better, after a couple weeks I swapped them back out for nkg’s that I checked the gap on, car ran better.

Pros: NGK's ran better

Cons: expensive plugs, poor performance

Vehicle: Mitsubishi Galant

Bosch › Spark plug

Genids 18 Jul 2025, 13:09

Rating 1.0

Never use bosch plugs. I work in a bosch car service and we won't use em, NGK only. Bosch stuff is garbage

Cons: Bosch stuff is garbage

Bosch › Spark plug

-VWNate 20 May 2025, 01:34

Starting:
Idle:
Acceleration:

Rating 1.0

BOSCH stopped German manufacture of spark plugs long ago, they suck now.

Cons: they suck now

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