Bosch Spark Plugs

Has anyone ever tried one of the following Bosch Spark Plugs:https://www.boschautoparts.com/en/auto

Double Iridium Spark Plugs (P/N# 9613)

or

Double Platinum Spark Plugs (P/N# 8122)

or

Platinum Spark Plugs (P/N# 6731)


If so, your experiences, opinions and or reviews about them and usage?

Did you encounter any engine problems, hesitation, misfires, etc.?

Would you use them again or stick with OEM spark plugs?

Currently all that I've ever used are OEM spark plugs (and more than likely will continue) but am just curious to know if others here have used Bosch Spark Plugs before.

If the results are better than OEM then I just might be willing to try them out.


Spark Plugs

Platinum Spark Plugs
Bosch Platinum Spark Plugs are engineered for up to 2X longer service life.*

Restrictions: Do Not Gap, Gap is Preset

Part Number:6731





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Double Platinum Spark Plugs
Bosch Double Platinum Spark Plugs are engineered for up to 3X longer service life.*

Restrictions: Do Not Gap, Gap is Preset, Original equipment is nickel

Part Number:8122





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Double Iridium Spark Plugs
Bosch Double Iridium Spark Plugs are engineered to deliver both high performance and long life, representing the best of OE spark plug technology. The ultra-fine wire design and laser welded tapered ground electrode deliver optimum performance, while the iridium center electrode and ground electrode help it to go the distance. Unlock the performance in your engine with Bosch Double Iridium Spark Plugs.

Restrictions: Do Not Gap, Gap is Preset

Part Number:9613

 

I wouldn't recommend spending the extra money unless you have a supercharger or other mod that makes changing plugs difficult. Buy the cheap-ass Densos and change every 30k. Way better than running expensive plugs for 100k.

 

OEM plugs are best.

 

I change out the spark plugs on my 2008 Tacoma once every year, regardless of what the mileage is on my odometer and no super nothing just the plane engine.

I don't mind changing out the spark plugs. Yea I know all about the driver side hassel getting to them, replacing them, etc.

Like I stated before, have always used OEM spark plugs but was considering Bosch after reading about them and just wanted to know from others here if anyone had or has tried them and get their opinions, that's all.

 

I think I've found the answer to my own question about Bosch spark plugs here: https://www.tacomaworld.com/threads/bosch-spark-plugs.212970/

Looks like I'll stick with OEM Denso's or NGK spark plugs.

 

Stick with OEM Denso plugs every 30k for the 1GR. /thread.

 

OEM x2

 

Can't beat that 'fresh plug' feeling after you change them out either.

 

I use Bosch in my old German gas car. They do well.

Asian cars do best on Denso or NGK.

Just my opinion.

 

I put a Bosch plug in the Briggs & Scrapiron engine on my lawn mower and it starts on the first pull!

 

http://www.ebay.com/itm/SIX-OEM-TOY...ash=item4b1f4266aa:g:yP8AAOSw7NNULjMN&vxp=mtr

 

Every plug I have had that failed early on was a Bosch. I'm not impressed with their quality.

NGK or Denso.

 

The Truth About Spark Plugs....

 

No one ever gained any power through a tuneup. Stick with factory plugs. The fancy ones can actually hurt performance.

 

You don't need "double" anything in the 4.0, or any modern engine using a coil-on-plug (COP) ignition system. They were developed as universal replacements for OEM plugs used in the wasted spark systems that replaced distributors many years back.

When a DC electrical arc occurs some molecules of the negative electrode are carried by the electron flow¹ from the negative tip electrode and deposited onto the positive side electrode; eroding the negative tip. In a wasted spark system one plug fires with a conventional (tip negative to side electrode positive as in an old coil/distributor Kettering system) current flow, and the other fires with a reversed polarity (side electrode negative to tip posive) as shown below:


With the "negative firing" plug the tip is eroded and deposited on the side electrode, so you want the tip to be made of a material more resistant to erosion; nickel-chrome alloy in conventional so-called "copper" plugs, platinum or iridium in precious metal electrode plugs.

However on the "positive firing" plug electrons (and some of the electrode) flow from the side electrode to the tip--this requires that the side electrode be made of (or tipped with) an erosion resistant material.

So what manufacturers did, to save 15¢ or 20¢ per plug was to specify half of the OEM plugs with alloy or precious metal tips, and half with alloy/precious metal side electrodes. Ford used a wasted spark ignition on the early 4.6 L engines in Mustang and indicated such in the service manual when plugs were reused (see below). The PG plugs have Platinum Ground (side) electrodes only, the plain ol' P plugs were Platinum tip only:



As these OEM plugs were not intended to ever be available as repair parts, plug makers produced the "double" whatever plugs as universal replacements. The marketing departments loved this and immediately began touting "double" plugs as being somehow superior to plain ol' single whatever plugs--which they are in wasted spark system, however in a COP or old coil/distributor system they offer no advantage except to make plug makers richer.

Shorty story, they are not needed in any contemporary COP based ignition systems. And getting to the OP's original question, I installed Autolite AP5325 single platinum ($3.09 each from Autozone) plugs in my '09 a couple days after I got it last October, and 4000 miles ago. They'll be good for at least 60k miles which at my 6k miles/year means I will probably never have to change them.

My Honda Silver Wing 600 calls for conventional plugs to be changed each 12k miles, I installed Autolite iridiums in that 21k miles ago and it starts and runs like a champ.

Oh, forgot to add that I am not a big fan of Bosch spark plugs--to much hyperbole in their marketing for me...

---------------------------------
¹ - Volta got it wrong when he identified "positive" and "negative". In fact it is the negative pole that has a surplus of electrons and the positive pole which has an electron deficit. DC electrons flow from the negative to the positive pole, not 'tother way around as he thought.

 

I really don't think it matters. People's perception of adverse effects using Bosch or other brands is mostly subjective and anecdotal in my opinion. The non-Japanese manufacturers would not list them for a given engine if they hadn't test them for proper fit and function. I used to put NGK's in my dad's 1974 Dogde van with a 360 V8 and they ran no different than Autolites or Champions. Why does Toyota recommend NGK or Denso plugs? Maybe, cause they own part of both companies? That may also explain why Toyota uses both brands. I use NGK and Denso Iridiums primarily because they are more affordable. I currently have NGK Iridiums in my Tacoma - they happen to be the same part # that came in the wife's Lexus. Coming up to 90K on them and they work fine - cleaned and re-gapped (against NGK's recommendation, I might add) them at 80K.

 

+1

 

I've heard many horror stories about Bosch.

I only use the Denso Iridium in my Tacoma simply because they last longer and I don't have to change the plugs as much. Pretty much the same reason I run synthetic oil, less work that I have to do, more time to spend with the family. I'd have to change the coppers every 2-3 years or the Iridiums every 6-8 years. It's all personal preference, initial cost is higher but almost evens out through the life of the part.

 

I know everyone on TW swears by changing coppers every 30k miles, but I don't have the time and drive way too much to be doing plugs every damn year.

I also know that people on TW swear that their motor runs poorly on platinum or iridium plugs. I'm pretty sure their butt dyno is looking for something to complain about.

I run NGK Laser Iridiums, and while true that there's no performance increase the increased service life is helpful.