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Discussion Starter · #1 ·
I purchased the Autolite Platinum Pro around 32K... I am up to 79K and replaced them with the Bosch +4's.

The plugs mentioned that you could run them up to 5 years, unlimited mileage, but when I pulled them, the gap was at .05" after 40K. [I will have had the car 2 years on March 31]

The book recommends .039 to .041"

I am hoping I still have the receipts... They have a money back guarantee...


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I heard good and bad things about those Bosch plugs with the 4 electrodes. How much were they? Does it improve performance at all?


<hr width=60% noshade size=1 align=left>2000 Hyundai Elantra GLS
-PIAA 1100x superwhite foglights
-PIAA Plasma headlights
-Sharkracing clear corners w/ amber bulbs
-Deflector
-10" pioneer subwoofer w/ 600 watt Kenwood amp
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Discussion Starter · #3 ·
I haven't noticed anything on the performance aspects yet. The plugs will probably perform better just because they are brand new. The gap on the plugs that I pulled was over spec.

The Bosch +4's cost me about 26$. Once I get some good gas, I will post what the gas mileage I get on these...

I had good luck when with Bosch when I owned the Audi... They were the only plugs I could run that gave me good fuel economy and power without burning up the plugs.


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Pieces of **** they will not give you money back as they say. If you installed them and your not a class "A" mechanic then it broke the warranty. Gain for a bit. say 1000km then it drops. mine lasted me 2months in my 1.5L accent gsi. daily driven. Then wont replace them the bastards. I had hyundai install ngks way better performance they lasted me 60000km with out any problems. The ngk caused fails of spark in cyl 1 2 3 and had to have my car towed as I chked everything thinking the plugs were fine since they were new when I found out what the issue was i was pissed. Bosch +4 platinum piece of shi* IMO<img src=/images/forums/snitz/cool.gif width=15 height=15 border=0><img src=/images/forums/snitz/guns.gif width=33 height=16 border=0><img src=/images/forums/snitz/guns.gif width=33 height=16 border=0><img src=/images/forums/snitz/guns.gif width=33 height=16 border=0>


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