<![CDATA[Bosh Platinums]]>I figured last time i did a tune-up on my car id go with some decent plugs, apparently Bosch Platinums arent that great. So i noticed a rattle in the engine of my Mercedes Before i parked it for the winter, i tried and tried to locate the source, checked the timing chain (a known weak link in the 2.3's), that was good, check clearances, not an issue. For the life of me i couldnt find the cause. this morning i decided to do a tune-up on the car and...... Holy Shit !!! i found the problem, The whole electrode, porcelin and all are gone out of the no2 plug!!! No more 'high quality' Bosh Platinums for me. Uggh i dont want to remove the head, Just because a Fu%^ing cheap ass spark plug, im sure it wasnt nice to the piston and head. I guess at least i have a fallback, a spare engine.

]]>https://fargostreet.com/topic/12781/bosh-platinumsRSS for NodeThu, 28 May 2026 20:09:20 GMTTue, 18 Dec 2007 16:29:45 GMT60<![CDATA[Reply to Bosh Platinums on Thu, 20 Dec 2007 17:45:46 GMT]]>

capitlj;199538 wrote:
They'll make it right, unless they can pin some, "The plug was not installed properly" bullshit on you.

Well i hope they do make it right, I have doublechecked the application, and it is the proper plugs. and they are a oem aprooved aplication for mercedes from what ive been told. i think it was a defect in the plug, the guy seemed really cool. but... we will see how cool when the time to fix it comes. :icon_scratch: i dread seeing the boroscope image, cause the peice that fell out is over a 1/2 inch long and about 1/4 inch wide, porcelin and platinum cant be good on a piston and cylinder wall, nor the valves.:icon_puke_r:

]]>https://fargostreet.com/post/188545https://fargostreet.com/post/188545Thu, 20 Dec 2007 17:45:46 GMT<![CDATA[Reply to Bosh Platinums on Thu, 20 Dec 2007 17:26:05 GMT]]>They'll make it right, unless they can pin some, "The plug was not installed properly" bullshit on you.

]]>https://fargostreet.com/post/188544https://fargostreet.com/post/188544Thu, 20 Dec 2007 17:26:05 GMT<![CDATA[Reply to Bosh Platinums on Thu, 20 Dec 2007 15:26:14 GMT]]>Well we will see what happens, I got ahold of a Bosch rep today, he is starting a repair claim on the car, he said they may have it towed to Valley Imports since that is the mercedes dealer in the area, and have it looked at and repaired if nessecary, he said the platinum electrode may have done some serious damage to the block and internals if it hadnt been 'spit' out the exhaust, and i told him that is my fear, cause the engine had just recently started to burn oil. so im keeping my fingers crossed.

]]>https://fargostreet.com/post/188539https://fargostreet.com/post/188539Thu, 20 Dec 2007 15:26:14 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 21:55:58 GMT]]>yeah but itrfan isn't the biggest person in the world either.

]]>https://fargostreet.com/post/188474https://fargostreet.com/post/188474Wed, 19 Dec 2007 21:55:58 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 21:25:42 GMT]]>LOL, hondas u dont need small hands...ask itrfan when he was doing wiring on the CRX while standing in the engine bay...yes the motor was even in there...

]]>https://fargostreet.com/post/188470https://fargostreet.com/post/188470Wed, 19 Dec 2007 21:25:42 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 18:25:54 GMT]]>Not everyone has "honda" hands there brandon.

]]>https://fargostreet.com/post/188458https://fargostreet.com/post/188458Wed, 19 Dec 2007 18:25:54 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 18:01:42 GMT]]>My 3800 in my old regal wasnt bad...just gotta have small wrists to get in there, lol..

]]>https://fargostreet.com/post/188456https://fargostreet.com/post/188456Wed, 19 Dec 2007 18:01:42 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 17:39:18 GMT]]>If you have the right plug the platinum will not fall off, Champion in particular uses a laser to "weld" the platinum tips on, thats why AC Delco doesn't make their own platinum/iridium plugs. They buy them from Champion and NGK then put AC part numbers on em. I have changed plug on a few cars that had 100,000 on them, one of which was mercury mystique and a couple of GM 3800's, and the plugs looked no worse than the one I pulled out of my Cougar that had 25,000 on them. In the case of those engines you absolutly cannot use copper plugs, the waste spark ignition system will destroy those plugs very quickly. I can't count how many people have come into my store with a Grand Prix/Bonneville/Buick 3800complaining about a miss, claiming they just changed the plugs. They bought copper ones and guess what, 3,000 - 10,000 miles later the plugs are shot. Who wants to change those plugs all the time? 3800's are a PITA. Even using the motor mount trick they still are not fun at all. I can change my plugs in no time, as I'm sure some of you guys can, but a 3800, or a ford 2.5 V6 take a little more time.

]]>https://fargostreet.com/post/188452https://fargostreet.com/post/188452Wed, 19 Dec 2007 17:39:18 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 15:55:19 GMT]]>have you pulled the plugs out of a new car at 50-70k miles??? I have a number of times, and more often than not, that awesomely sweet ass platinum disk is gone anyway. Thats right, i would love to have that nice little piece go through my heads and try to take out a valve. seriously ive taken platinums out of 50-70k mile motors that you would swear had been in there for decades, they looked horrid. Oh, and when the platinum falls off, guess what, you have an electrode with half the diameter thats wearing faster than shit.
BTW, copper plugs last on average 30-50k miles, so i dont see what the big deal is, for me thats a plug change every 3-5 years.
Gary

]]>https://fargostreet.com/post/188441https://fargostreet.com/post/188441Wed, 19 Dec 2007 15:55:19 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 11:15:05 GMT]]>id rather spend the 20 minutes every 8000 miles or so to change my plugs, especially after this, and i wont go back to these rediculosly overpriced things, a lot of people are right NGK is a very good plug, i have used them in snomobiles, atv's, motorcycles, and lawnmowers, they always work great. I just thought that this is not a racer or a beater, this is my weekend toy, platnums may be the way to go, apparently not for the price. I have never seen standard plugs fail in this way before, i have seen the gaps, or bridges (whatever you want to call them) missing before, usually in snowmobiles from shrapnel lol :icon_scratch:

]]>https://fargostreet.com/post/188425https://fargostreet.com/post/188425Wed, 19 Dec 2007 11:15:05 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 07:13:44 GMT]]>That's the only thing platnium plugs do is last longer, but then again the copper plugs burn a lot better. I guess i'd rather take the whole 2-3min and spend the whole $10 to replace my plugs a couple times and have better ones in...

]]>https://fargostreet.com/post/188413https://fargostreet.com/post/188413Wed, 19 Dec 2007 07:13:44 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 06:46:35 GMT]]>I don't know why you guys think Bosch suck or that platinums are crap. Yes you can get the same power out of a copper vs iridium/platinum plug maybe more idk. All plugs fail and in certain cars copper plugs will fail miserably long before the 100,000 mile service life of a platinum/iridium plug, try within 3,000 miles. I ran Bosch platinums in my 302 for 10k and had 0 problems. They were completely usable when I pulled them, and would have if they fit my new heads. I ask you this do any of the OEM's claiming a 100,000 mile 1st tuneup use copper plugs, if copper was so great why bother with paltinum/iridium in the first place? By all means if you have nothing better to do than change your plugs every year get copper ones. However if you're not building huge power and don't want the hassle of changing them all the time, platinum/iridium is the way to go especially if you have a DIS system.

]]>https://fargostreet.com/post/188410https://fargostreet.com/post/188410Wed, 19 Dec 2007 06:46:35 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 05:09:39 GMT]]>i tried the platinum 4's on my fuel miser.. just like any other plug change (when your plugs have been used for ten years) the car ran a little more smoothly. Nothing special. They foul more visibly, having way more shiny surface area between the spark and air/fuel mixture. I'm switching to NGK's on the next plug change, probably pretty soon. They're just better. And cheaper. NGK's you get what you pay for (less than 2 bucks) and more. better than not getting what you paid for in other plugs. or having one blow apart. hope there's no major damage.

]]>https://fargostreet.com/post/188395https://fargostreet.com/post/188395Wed, 19 Dec 2007 05:09:39 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 04:52:05 GMT]]>

KA-T_240;199337 wrote:
anyone have any proven gains from there expensive ass plugs?
Last year when I put the turbos on Andy had me change the plugs at the same time. I never would of guessed the plugs would have given us a gain of 400+ hp:rolleyes:

]]>https://fargostreet.com/post/188392https://fargostreet.com/post/188392Wed, 19 Dec 2007 04:52:05 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 04:22:37 GMT]]>i wasnt saying that it being a platinum plug was the reason it failed, just the fact that platinums fail in general. Also, you guys that bought expensive ass iridium plugs, those suck too, ESPECIALLY in a boosted application, that is as big of a no-no as platinums. Look at what guys making 1500+hp are using, most are standard type plugs for a reason.
Gary

]]>https://fargostreet.com/post/188389https://fargostreet.com/post/188389Wed, 19 Dec 2007 04:22:37 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 03:27:13 GMT]]>NGK FTW.

It's what I run in my DD.

]]>https://fargostreet.com/post/188382https://fargostreet.com/post/188382Wed, 19 Dec 2007 03:27:13 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 00:47:08 GMT]]>

weshole;199340 wrote:
Im not sure on gains. But I do recall someone having spark plug issues when boosting the shit out of their cars. I thought it was either Kevin or Burgess. It probably has nothing to do with wether they were platinum, but maybe they can chime in here.

I had plug blow out, but that was my mistake. Stock plug gap while running 15+psi

]]>https://fargostreet.com/post/188362https://fargostreet.com/post/188362Wed, 19 Dec 2007 00:47:08 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 00:20:12 GMT]]>kinda dissapointing lol i have so much work and money in this car, i dont want to have to remove the head, but ...... what can ya do???

]]>https://fargostreet.com/post/188359https://fargostreet.com/post/188359Wed, 19 Dec 2007 00:20:12 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 00:17:13 GMT]]>

Goodnbuzzd;199350 wrote:
but personally i beleive that the electrode/porcelain was defective.

Based from my knowledge, I would be inclined to agree.

]]>https://fargostreet.com/post/188358https://fargostreet.com/post/188358Wed, 19 Dec 2007 00:17:13 GMT<![CDATA[Reply to Bosh Platinums on Wed, 19 Dec 2007 00:08:37 GMT]]>

weshole;199335 wrote:
I agree with Andy on this one. I don't care what brand they are, I have seen EVERY major brand of spark plug fail in one way or another. (Some NGK's too). I'll lay money that the Platinum on the electrode had absolutely NOTHING to do with the failure of the plug. As to what caused it, that's up for debate but, dont blame "platinum" or "Bosh" for the problem.

I really dont think it is a heat issue, these also cross reference to the engine in the books, i have seen what lean conditions do to plugs and the remaining plugs have no sign of metal blowing away and are showing the nice tan or brownish coloring. also i have heard from other people about this problem with platinums in general before, but usually in turbo cars. i will agree that it may not necisarily be the fact that it is a platinum, but personally i beleive that the electrode/porcelain was defective. i have seen the bridges fall off of plugs before but for the whole electrode to fall out clear up to the metal casing isnide to me is odd.

]]>https://fargostreet.com/post/188357https://fargostreet.com/post/188357Wed, 19 Dec 2007 00:08:37 GMT<![CDATA[Reply to Bosh Platinums on Tue, 18 Dec 2007 22:51:10 GMT]]>Im not sure on gains. But I do recall someone having spark plug issues when boosting the shit out of their cars. I thought it was either Kevin or Burgess. It probably has nothing to do with wether they were platinum, but maybe they can chime in here.

]]>https://fargostreet.com/post/188347https://fargostreet.com/post/188347Tue, 18 Dec 2007 22:51:10 GMT<![CDATA[Reply to Bosh Platinums on Tue, 18 Dec 2007 22:08:06 GMT]]>anyone have any proven gains from there expensive ass plugs?

]]>https://fargostreet.com/post/188344https://fargostreet.com/post/188344Tue, 18 Dec 2007 22:08:06 GMT<![CDATA[Reply to Bosh Platinums on Tue, 18 Dec 2007 22:07:49 GMT]]>

dynotune;199308 wrote:
the scenario you have shown in the picture has nothing to do with the quality of the spark plug- it looks like it was too hot (like you got the wrong ones!) I am not a fan of the bosch plugs either, but this is an application problem, not a part failure

I agree with Andy on this one. I don't care what brand they are, I have seen EVERY major brand of spark plug fail in one way or another. (Some NGK's too). I'll lay money that the Platinum on the electrode had absolutely NOTHING to do with the failure of the plug. As to what caused it, that's up for debate but, dont blame "platinum" or "Bosh" for the problem.

]]>https://fargostreet.com/post/188342https://fargostreet.com/post/188342Tue, 18 Dec 2007 22:07:49 GMT<![CDATA[Reply to Bosh Platinums on Tue, 18 Dec 2007 21:59:38 GMT]]>

RidinRails;199312 wrote:
i use denso iridums and they're great for $12 a piece ha
I got mine new-in-box off of eBay for $48 (for 6 plugs). You do get what you pay for.

]]>https://fargostreet.com/post/188338https://fargostreet.com/post/188338Tue, 18 Dec 2007 21:59:38 GMT