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platinum 4 plugs


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15 replies to this topic

#1 mattri

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Posted 18 January 2005 - 11:48 PM

Anyone using the Bosch, or any other platinum 4 plugs?

#2 ShawnW

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Posted 18 January 2005 - 11:56 PM

Old school Subaru's dont seem to appreciate the Platinums. Copper plugs by NGK (stock plug) seems to work the best.

#3 mattri

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Posted 19 January 2005 - 12:02 AM

Thanks for the reply, it seems people here really like the NGK's. I used the Bosch platinum 4's in a 91 Loyale and they seemed to make a big difference, just curious what others thought. Matt.

#4 ballitch

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Posted 19 January 2005 - 12:02 AM

you can run platinum, but NKG seem to be the best, what ever you do dont use the iridium spark plugs, they burn too hot for subie motors, or so im told.




~Josh~

#5 stngllhm

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Posted 19 January 2005 - 12:12 AM

from what i've heard the bosch platlinum plugs are bad luck. a friend of mine told me that there are cases of engine melt down cuz of bosch. i'm not sure i believe that. but i have heard from quite a few people to stay away from the bosch platlinums. just my 2 cents worth

#6 rallyruss

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Posted 19 January 2005 - 12:14 AM

Old school Subaru's dont seem to appreciate the Platinums. Copper plugs by NGK (stock plug) seems to work the best.


what shawn said.

the bosh platnum plugs dont have the heat ranges correct. some cars they work fine others are way off. I dont trust them any more. too much money for a plug that might be better for that car.

#7 stinky

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Posted 19 January 2005 - 12:37 AM

I've got NGK Iridiums in 2 of my subarus and they work a treat ( ea81T and ea81 ). Best thing is, don't have to replace them for 100,000 kms.

#8 bratman2

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Posted 19 January 2005 - 08:28 AM

I also have the NGK Iriduim plugs installed, about 3k ago, no complaints and runs great. Can't really tell a difference over standard NGKs that have always worked great. Only installed the Iriduims because when I bought the Brat over 7 years ago the left back plug had been cross threaded and is a pain in the but to get threaded in correctily, I doubt I will leave them in 100k though, maybe 50k. Installed Bosch Plats several years ago and immediatily developed a miss that would not go away until I switched the Bosch plugs out w/200miles on them, also had this same problem w/ wife's former Mustang. Only time I have ever bought Bosch plugs and I will never buy another Bosch plug.

#9 Do It Sidewayz

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Posted 19 January 2005 - 08:42 AM

just run the coppers.. they are a couple bucks a piece. and they aren't a chore to change...

on some of the 2.5's and stuff they are a HELL of a job to change...on the EA82's they are right on top and won't take you more than about 10 mins to change.

#10 swiftt

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Posted 19 January 2005 - 12:17 PM

Platinum plugs are very sensative to air/fuel mixture and foul easily if the engine's running on the rich side. You should NOT run platinum in a carburated engine unless you like to spend (waste) your money! Carbs, and Bosch's CIS injection for that matter, are not precise enough to ensure a useful and reliable lifespan with platinum plugs. In my opinion, EFI is the only fuel delivery system efficient enough to make use of the longevity platinum can provide.

I, too, endorse NGK's. I've had great luck with them in my applications ranging from German, to British, to Japanese cars. Ask me and I'll tell you "Autolite and Champion are JUNK!"

#11 rallyruss

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Posted 19 January 2005 - 01:47 PM

Platinum plugs are very sensative to air/fuel mixture and foul easily if the engine's running on the rich side. You should NOT run platinum in a carburated engine unless you like to spend (waste) your money! Carbs, and Bosch's CIS injection for that matter, are not precise enough to ensure a useful and reliable lifespan with platinum plugs. In my opinion, EFI is the only fuel delivery system efficient enough to make use of the longevity platinum can provide.

I, too, endorse NGK's. I've had great luck with them in my applications ranging from German, to British, to Japanese cars. Ask me and I'll tell you "Autolite and Champion are JUNK!"


I agree mostly. the fouling that you may have seen is quite often due to the incorrect heat range of he bosh platnums.
regular bosh plugs in a vw/bmw/audi run really well.

basically it has become very clear to me that cars usually run best on the stock plug type.
look at the newer dodges/jeeps. they NEED to run champion plugs to run properly. they dont last long but if you try to get tricky and put a "good" plug in them they get all up set. somtimes setting codes.

#12 DerFahrer

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Posted 19 January 2005 - 01:53 PM

I always say the country that the plugs and car were made in should be the same.

Japanese cars, use Japanese (NGK or Denso) plugs. German/European cars use German/European (Bosch) plugs. American cars use American (Motorcraft, Champion, Delco) plugs.

But you can use NGK's in anything really, coz NGK's are the best plug evAr!!!

#13 erik litchy

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Posted 19 January 2005 - 02:00 PM

regular bosch plugs are ok but people have more problems with the kind with the mini electrode than any othere. Champion are really mediocre. they have worse internal resistors that break down over time.

#14 RavenTBK

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Posted 19 January 2005 - 05:00 PM

NGK resistor plugs are the only way to run. Be it standard plugs, or the V Power plug.. the Subie loves em.

Hell, dont tell anyone, but I even run NGK's in my Bronco.Posted Image

#15 mattri

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Posted 19 January 2005 - 09:03 PM

NGK's in a Bronco! Now I've heard it all. I run Autolites in the old Bronco and in the Mustang, they seem to work great. I'm surprised people are so opposed to the Bosch platinum's here. I ran them in that wagon and they worked great, I never had any fouling problems and they smoothed it out and made a marked improvement to the NGK's I had been running. I never had any heat related problems either. In fact, we gave that car to a kid we know and he's still driving it, as far as I know those platinums are still in it.

#16 RavenTBK

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Posted 19 January 2005 - 09:34 PM

Well, each vehicle is different. They all respond differently to different parts. Seems as though the consensus is NGKs in the Subies.. although some cars actually run good on others. For the most part, its trial and error. If your junk runs good on the Bosch parts, rock on. My junk falls in line with the others, preferring NGKs.

I guess we shouldnt say we're all opposed to them, its just most of us have tried, and failed. As I just said, each car has its own quirks. Embrace them, and run with it. :headbang:




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