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
Reviews of Bosch spark plug
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I use Bosch everytime I can, minus their $90 spark plugs lol
Cons: expensive spark plugs
Avoid the NGK’s Bosch or “Volvo” (also Bosch) plugs are way better than the NGK’s.
Pros: better than NGK
Cons: NGK not recommended
Vehicle:
Volvo
BOSCH stopped German manufacture of spark plugs long ago, they suck now.
Cons: they suck now
I had good luck with ngk bp6hs, Bosch w8Bc, champion l87yc and renault oem short thread (yes, really.) plugs. Bosch w8ac used to be good but i had some arrive not working out of the box recently so I'm now avoiding them.
Pros: good luck
Cons: not working out of box
Vehicle:
Volkswagen
the spark plug is less than 10k km old (bosch) so I initially did not change it. Decided to change it anyway to original mercedes (turns out made my NGK) bam emission passed, LTFT now hovers at 5-8%.
Pros: emission passed, LTFT improved
Cons: high HC, positive LTFT
Vehicle:
Mercedes
Mileage: 10000 km
Mann fuel and air filter, Bosch distributor cap and rotor, NGK spark plugs and NGK wires. I had Bosch spark plugs W6DPO, the car runs exactly the same.
Cons: car runs the same
Part number: W6DPO
I tried Bosch plugs on a 1995 NG900. Problem as described. When they state compatible, that might only address mechanical fit. Stick with the original plugs
Cons: problem as described
Vehicle:
Saab
I've changed my spark plugs three times, always with the Bosch Iridium, never had any problems. Pre-gapped, takes me about 30 minutes from start to finish. Lasts me about 90,000 miles.
Pros: no problems, lasts long
Mileage: 144840 km
I personally refuse to put anything Bosch made in my cars. All were genuine Bosch parts from my local parts place that has never done me wrong.
First it was their wipers, paid good money for them, squeeled worse than the worn old ones. Figured it's a fluke.
Then I had a set of spark plugs, they were gapped correctly, but the car ran like absolute garbage and I couldn't figure it out until I put the probably 20 year old Valeos back in and it ran fine again.
Then I had a crankshaft sensor that was bad out of the box, and that was the last straw for me. I don't care if it's coincidence or a bad batch, or if they've improved it since, I'm done with any Bosch parts unless it's NOS from the early 2000s or earlier.
Cons: poor quality, unreliable
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