Spark Plug Options
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True Car Nut
Joined: Sep 2005
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what'* wrong with home brewed?
I run Autolite in most everything I drive. The first time I changed plugs in my Bonne I grabed Bosch, they lasted me about 50k miles, went and threw in another set of Bosch and she ran worse, went to Autolites and never went back.
Used to think the rear plugs on a 3800 were a PITA, then I changed the plugs on my sis in law'* '08 Sonota, never complain about a Bonne again lol
I run Autolite in most everything I drive. The first time I changed plugs in my Bonne I grabed Bosch, they lasted me about 50k miles, went and threw in another set of Bosch and she ran worse, went to Autolites and never went back.
Used to think the rear plugs on a 3800 were a PITA, then I changed the plugs on my sis in law'* '08 Sonota, never complain about a Bonne again lol
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Expert Gearhead
Joined: May 2006
Posts: 29,661
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From: Sheboygan Wisconsin
I look at it this way, you can't beat the price of autolite coppers, and I have yet to have a single problem with one. I change them once a year and they come out looking great.
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Posts like a Supercharger
Joined: Nov 2010
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From: Pines of Carolina
I've had great luck with Bosch products--in the '73 VW Super Beetle I had in high school 
I just re-did the plugs and wires on my Bonneville and went bone stock with the same AC'* that came from the factory. The wires were NAPA'* house brand. For a whopping $36, the car runs like brand new.
I just re-did the plugs and wires on my Bonneville and went bone stock with the same AC'* that came from the factory. The wires were NAPA'* house brand. For a whopping $36, the car runs like brand new.
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Joined: Jan 2006
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From: Purgatory, Pennsylvania
LOL, makes since in a Beetle. I don't think any of us know the true why of the anomaly of Bosch vs GM V6'*. I have had luck with other engines myself, but also one who had GM V6'* ran like crap out of the Bosch box. One 4.3 I had in an *-10 went from rough idle with old ACDelco to instant hard start/missing with new Bosch. Exchanged for AC... back to smooth. Alot of 3.8 drivers have had the same.
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From: Indianapolis, IN
When I first did a change of plugs on the SLO, the ones I took out were Bosch. No noticeable difference, but then the SLO was completely stock except for a gutted air box (previous owner).
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Joined: Jun 2003
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From: Las Cruces, NM
If I remember correctly, the platinum issue was primarily on the supercharged engines, and it was that they didn't last very long at all, and sometimes liked to detonate. NA doesn't really care too much.
I have seen pictures, they were not pretty.
I have seen pictures, they were not pretty.
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Certified GM nut
Joined: Mar 2005
Posts: 2,284
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From: New Milford, CT
I see these two paragraphs posted all over the Internet, which appear to be Bosch'* take on the matter:
For what it'* worth, I believe GM calls for iridium plugs in the L36. Many members (including myself) have no problem with coppers. Seems to have something to do with platinum itself.
There are the facts; draw your own conclusions.
Bosch acknowledges a problem with using their Bosch Platinum spark plugs in engines with ignition systems that employ 1 coil for each pair of spark plugs (also known as a "waste spark ignition system").
The problem that Bosch has acknowledged when using their Platinum plugs in engines with waste spark ignition systems stems from the tendency of electrode metal to get transferred depending upon the polarity (direction of current flow) of the spark. In waste spark ignition systems, 1/2 of the plugs always see reverse polarity sparks. Given the very narrow platinum
center electrode of the Bosch Platinums, performance will be degraded more significantly when reverse polarity sparks will cause material to be transferred from the large ground/outer electrode onto the narrow platinum center electrode'* exposed end surface.
The problem that Bosch has acknowledged when using their Platinum plugs in engines with waste spark ignition systems stems from the tendency of electrode metal to get transferred depending upon the polarity (direction of current flow) of the spark. In waste spark ignition systems, 1/2 of the plugs always see reverse polarity sparks. Given the very narrow platinum
center electrode of the Bosch Platinums, performance will be degraded more significantly when reverse polarity sparks will cause material to be transferred from the large ground/outer electrode onto the narrow platinum center electrode'* exposed end surface.
There are the facts; draw your own conclusions.
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Posts like a Supercharger
Joined: Nov 2010
Posts: 191
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From: Pines of Carolina
That would stand to reason. I know GM specifies iridium plugs for the Northstar. If I recall correctly, the stock AC plugs for the Northstar are re-branded Denso Iridiums.
I see these two paragraphs posted all over the Internet, which appear to be Bosch'* take on the matter:
For what it'* worth, I believe GM calls for iridium plugs in the L36. Many members (including myself) have no problem with coppers. Seems to have something to do with platinum itself.
There are the facts; draw your own conclusions.
For what it'* worth, I believe GM calls for iridium plugs in the L36. Many members (including myself) have no problem with coppers. Seems to have something to do with platinum itself.
There are the facts; draw your own conclusions.
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Posts like a Turbo
Joined: Sep 2010
Posts: 480
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From: MASS
I bought some E3'* for my Chevelle..seems like it is little more responsive..maybe i will try them in bonne..
