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56 of 57 people found the following review helpful
on January 24, 2010
These have been running strong now for 30,000 miles. They start the car 1-crank faster and have not given me any trouble. Fuel economy is what it should be as well.

I will purchase these again when they are worn. Finally, a good spark plug from Bosch!

-- Update --
It's now been a few more years and I've accumulated 60,000 on the plugs with no issues whatsoever. The mileage has been great, fuel economy is normal, and car still cranks quickly. I am replacing them as a regular tune-up only. These are so good that I'm buying them again!
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39 of 45 people found the following review helpful
I have two Toyota Camrys. A 2004 SE and 2006 LE. Both have the same 4 cylinder engine. I have always been religious about checking the gas mileage on my cars at every fill up because this relays to me if anything has gone awry. The '04 had 115,000 miles and the '06 had 45,000 when I replaced the plugs. I replaced them mainly to see if it would help the fuel mileage; unfortunately for me, no difference. I'm sure they are good plugs as Bosch is well known for their high quality, however next time I will probably replace using the factory spark plugs.
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17 of 18 people found the following review helpful
on July 22, 2008
Six month ago I popped these in my vehicle and the car continues to run smoothly and like new. I can't say that they increase performance in a noticeable manner, but I can say they didn't decrease performance. I'm happy overall.
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25 of 30 people found the following review helpful
on February 11, 2012
If you're up for a tuneup, these plugs are worth replacing the OEM plugs. My engine runs smoother and throttle response is noticeable. Don't expect miracles, like a sudden increase in MPG. You're not turning your car into a hybrid; just replacing old copper core, single arm plugs with a new material for better spark...with "hopes" of better performance. It's not much more expensive than copper plugs so it was definitely worth a try.

This model was a direct replacement for my aging 1996 Infiniti I30 V6. No problems with install but make sure to buy the anti-seize lubricant.

UPDATE: Took my car to the shop for other work and after pulling these plugs, they said this model 4501 was the wrong one for my 1996 infiniti i30. But Amazon's make/model filter listed that these work and they fit fine. Maybe the 4 electrodes makes the plug run hotter that may not be good on my old car? Not sure....I'll keep them in for a little while longer.

UPDATE #2: Sept 15, 2012. So a little over 6 months (5K miles) of running with these plugs, all of a sudden, my car stumbles on acceleration. After Googling for possible answers, came up on a few complaints about Bosch plugs failing. I replaced them with some single prong NGKs Vpower and the problem went away. The Bosch's didn't look like they failed but it may burn too hot for my old car. I'm glad the problem wasn't serious. I did receive my $4 rebate check so each plug ended up net $2 so not worth it going through Bosch's product guarantee return process (they don't cover S/H). Read that they discontinued these plugs and using the rebate to get rid of dead inventory. It may work for you but I would stick to something closer to OEM like NGK or Denso if I were you.
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9 of 9 people found the following review helpful
on November 20, 2011
Easy to install. Don't have to gap. Noticeable performance improvement. My old plugs had 60K miles and were pretty worn.
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32 of 40 people found the following review helpful
on November 4, 2007
I muat admit. I never did a tuneup on my 2002 Camry, I'm ashamed to say. time just got away from me. Then I noticed I was going to the pump far more often than I should. That forced me to think about a tuneup and replacing my plugs. Fortunately, I thought to spend the extra few dollars over the champions. No disrespect to them, but I just figured I'd put in the best since I was spending so much at the pump.

I put the these Bosch's in and boy oh boy!! I just had to check my consumption. I was averaging 32mpg after this tuneup procedure.

i'm satisfied. Never saw this type design before. Awesome!! worth every penny.
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8 of 8 people found the following review helpful
on August 26, 2011
The price was right. I've always had good luck with Bosch, particularly their automotive parts. I'm not sure of it was the new plugs or the oil change I did at the same time, but I did notice a slight increase (~3 MPG) in fuel economy in my Scion xA. Would buy again, especially at this price.
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10 of 12 people found the following review helpful
on November 7, 2007
Although Lexus told me using their plugs, would stop my spark knock (which they didn't). The Bosch Platinum IR Fusion Spark Plug did the trick. Now my spark knock was upon take off from a dead stop and only lasted about a second. Do not know if these will help you if you constant spark knock (think you have larger problem).
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4 of 4 people found the following review helpful
on August 11, 2011
The Bosch Platinum IR Fusion is an excellent plug. It has given excellent service in my old 96 Dodge Caravan 4cyl, my current 95 Chevrolet Astro van VORTEC V-6 :) , and many of the Ford products my brother has/is driving.
The particular plug number I bought, Bosch # 4501 is coincidentally the correct crossover to fit in Brigs & Stratten one and two cylinder riding mower engines. The Champion number they take is RC12YC. Compared to the Champions they are "expensive". My reasoning is the Briggs engines only have one or two chances to "get it right". Every time I put these in a Briggs engine there is a MARKED improvement in the way they run. MORE power, smoother running, less black smoke, more cut on a tank of fuel.
I also use synthetic oil (with Lucas full Synthetic Supplement & STP) in the engines. I get lower oil consumption to boot.
I figure more complete combustion of the gas means less dilution/contamination of the oil. That will help reduce oil consumption.

Ammo Guy 8-)
Aim small, miss small.
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4 of 4 people found the following review helpful
on January 19, 2011
You are not allowed to gap these spark plugs, which makes it difficult to make 100% that they are fit for your car. In my case, these plugs did actually give better mileage somehow, but I don't think that is as important as making sure you car runs SMOOTHLY (rough idle) and correctly. I went with NGK spark plugs the day after I put these in and the idle is perfect in addition to starting up quick. Fuel efficiency isn't quiet as good, but it may be my driving style.
Bosch is... "okay" but not recommended for Integras.
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