It doesn't look eroded. It looks like the centre electrode tip has fallen off. That shouldn't happen. I usually only use Bosch or NGK plugs. I've never heard of Auto lite...
Pros: reliable
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I have a 21 xlt 4wd 2.7 and I do A LOT of driving for work. Recently crossed 80k miles and it started misfiring like crazy shortly after that and threw a code. Pulled the plugs and they were definitely fouled. I did some reading and saw most people change the plugs out around this interval so I went ahead and did it. EVERY auto part store near me only had 1 or 2 oem plugs and I couldn\u2019t really wait so I went ahead and got BOSCH iridium plugs. Well I\u2019m noticing when I get on it or go to speed up at higher RPMs/gears, I\u2019m getting what feels like stuttering or very minor misfires every now but it\u2019s not throwing any codes.
Cons: stuttering, minor misfires
Mileage: 128747 km
August 28 2024 : Spark plug change Bosch 70,588
Vehicle:
BMW
Mileage: 113592 km
NEVER USE THE DEALER FOR REPAIR WORK!
I run more or less the same motor (2.1liter-276 Schrick-10.5CR), and I'm using stock Bosch spark plugs.
Pros: using stock plugs
Your observation is correct.
Bosch is the original manufacturer. Buying from them will be cheaper. Mercedes genuine just means they take the Bosch part and slap their name on it to say "yes, this component is up to our standard".
Pros: cheaper, original manufacturer
Cons: Mercedes mark up price
Changed valve cover/gasket and installed new Bosch plugs and NGK boots.
Car had slightly higher rpms at cold startup but didn\u2019t think anything was wrong. After a few days engine started to misfire. I did some research and it sounded like I should use OEM plugs. I purchased Nissan plugs from the dealer and replaced the Bosch plugs. Misfire went away, but higher rpms at cold start persisted.
Pros: misfire went away
Cons: higher rpms at cold start
Vehicle:
Nissan Altima
Mileage: 90000 km
If it is the skyactive-x be aware that the owners manual advises spark plug replacement at 40k miles and the Mazda plugs are \u00a340 each. I put aftermarket Bosch plugs in and it ran very lumpy and had to replace with Mazda ones.
Cons: ran very lumpy
Vehicle:
Mazda 3
I have a N55, e93 And went through the same back and forth between NGK and Bosch. My car is 100% stock. Ordered ZR5TPP33 Spark Plug - Bosch and the car runs just fine.
Pros: car runs just fine
Vehicle:
BMW
Part number: ZR5TPP33
My F15 had the Bosch ZR5TPP33-S from the factory. I replaced with ZR5TPP33 when doing the valve cover about 20K miles ago, and no problems so far.
Pros: no problems so far
Vehicle:
BMW
Mileage: 20000 km
Part number: ZR5TPP33
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What we know about Bosch spark plug
The brand is registered in Germany.
In March 2026, PartReview users have a mixed opinion of Bosch spark plug.
PR Score — 61 out of 100, based on 264 reviews and 832 votes. 145 positive reviews, 40 neutral reviews, 79 negative reviews. Average rating — 3.3 (out of 5). Vote balance: 515 up, 317 down.
In the ranking of the best spark plug this part is at position 3, behind Denso and NGK , but ahead of BRISK and OEM Volkswagen.
Users also evaluated the qualities of Bosch spark plug:
- Starting - cold starts are difficult - rated ambivalently. 3 points out of 5.
- Idle - engine shakes and runs unevenly at idle - rated ambivalently. 3.2 points out of 5.
- Acceleration - hesitation or stumbling when speeding up - rated ambivalently. 3 points out of 5.
Spark plug Bosch in car-specific ratings
See which car brands and models owners choose Bosch spark plug for. Below are car-specific ratings where this part is in the Top-3:
- Bosch ranked #1 in spark plug ratings for: Nissan Altima, Ford Ranger, Volkswagen Corrado, Volkswagen Beetle, Audi S4 .
- Bosch ranked #2 for: Toyota Corolla, Toyota Camry, Volkswagen Jetta, Volkswagen Tiguan, Audi A6 .
- Bosch ranked #3 for: Ford Focus, Hyundai Sonata, Audi A4, Mazda 3 .
Spark plug Bosch in comparisons
There are 16 comparisons of Bosch spark plug with other manufacturers on PartReview.
In particular, see which spark plug are better: Bosch or OEM Mazda, Bosch or OEM Honda, Bosch or OEM Audi, Bosch or OEM Subaru, Bosch or OEM BMW .