Can I use Bosch Platinum Plugs in the J30?

[noetic1]

I've been reading the other Infinity posts and saw what happened when Bosch Platinum +4 were installed.

Is the J30 engine as picky as the Q45 engine with spark plugs?

I recently changed the plugs on my J30 with standard Bosch Platinum plugs and it seems to be running fine. But then again I just put them in and have less than 200 miles on them.

[Eswift]

considering the NGK plugs that the factory specifies are the highest tier of platinum plugs NGK offers, might be an indicator that it as a good idea to stick to stock.

should cost $9 a piece.

autozone does not carry NGK.advance auto did not have them in stock but they were there within 24hrs.

also note that the Z community swears by them...

[cweberj30t]

I would strongly suggest using NGK platinums. Better safe than sorry.

[Dust N Bones]

When I brought my car in to have the plugs changed my mechanic used Bosch platinums without consulting me first. Supposedly NGK's were not available at the time. I have to say they really added some exitement to my I30.

I did some research on the internet and came accross a chart showing the Bosch platinum plugs have more platinum then any other plug. Wish I could find that again because it was very interesting.

[VimyJ]

NGKs only. Fouling problems with the Bosch.

[BadQ45t]

My Z mechanic will yank out fresh bosch plugs and put in vanilla NGK's, in Nissan's NGK are the only way to go.

[Q45tech]

The G20, J30, and Q45 have almost perfectly identical shaped combustion chambers and all used the same plug design/model/brand for development work.

[papadops]

I put Bosch Premium (split-fire type) plugs in my 93 J30T a year and a half ago, still running great. my .02 cents.

[maxnix]

I put Bosch Premium (split-fire type) plugs in my 93 J30T a year and a half ago, still running great. my .02 cents.

All Bosch plugs work great until the electrodes break off and start bouncing around in the combustion chamber.

With the documentation on this site (do a search), don't know why anyone would risk it. By the way, even with the plus 4, the spark always takes the shortest path. The other three electrodes are just ornamental. Extra Platinum does not affect spark quality. It is for wear only, and we know Bosch doesn't like to live in Nissan engines.

[VimyJ]

I put Bosch Premium (split-fire type) plugs in my 93 J30T a year and a half ago, still running great. my .02 cents.

It has been mentioned on this site previously but not in the last few months that Nissan engineers are very, very good. In my experience with the it, the J30 is an extremely well designed car. It amazes me when folks believe they can put a cone filter on their car and think that thay are doing something Nissan engineers were too stupid to think of or that the designers were too stupid to put a fancy "split fire" plug in the combustion chamber. Why were the Nissan guys so dull as to not incorporate the wonder "Tornado" fuel saver in their engines?

Memebers who have reworked their rides will tell you that true performance mods that have actually worked cost substantial dollars but do compromise the functionality of their vehicle in some way either in fuel economy or engine life.

A race car engineer once wrote, "Given the ranges of operating conditions passenger cars are exposed to, it is amazing that they function at all. We spend vast amounts of time setting a race car to work for a given race under conditions that vary by less than 10F degrees yet a passenger car is designed to function from -40C to +40C. That is amazing to me." (loose quote)

[WAMP]

What is the part#/type of NGK that should be used? They are stocked in Advanced Auto and other chain stores? Thanks.

[Eswift]

NGK PFR5G-11 stk#2647

[noetic1]

It just seems like a waste to change plugs with so few miles on them. But oh well, I guess it is better to be safe than sorry.

[cweberj30t]

Good call. By the way, it's Infiniti not infinity. Just thought I would correct you before someone else that is more intolerable does.

[noetic1]

Sorry to bring back this dead subject but I just got my NGK plugs from infinitypartsusa.com and noticed that the plug they gave me isn't the same part number Eswift posted.

The plugs I got are-Part No: 22401-1P116NGK PFR6G-11

Did they send me the wrong sparkplugs?

[90Q45blue]

Infiniti has recommended AGAINST using Bosch plugs. Also, a Bosch representative recommended against it. As Brian said, with all the documentation on this forum I can't see anyone using anything other than NGK's.

Nick

[DAEDALUS]

There are at least 3 that will work as far as I know. Maybe just a revised spec? What part # did they give you?

[noetic1]

Well, I just got off the phone with Joe from Infinitypartsusa.com and was told that NGK PFR6G-11 was the part number his computer had for my '94 J30.

My owners' manual lists the NGK PFR5G-11 as the 'standard' plug and the NGK PFR6G-11 as the 'cold type' plug.

Basically, I was also told that most Nissans use the NGK PFR5G-11 plug and Infiniti's use the NGK PFR6G-11 plug. And something about the plug's cold rating would only make a difference if my car was burning oil. But since my car isn't using any oil, I decided to just put these on.

So just a heads up for you guys replacing plugs and notice that the replacement plug isn't identical to the ones you pull out of the car.

Q45Tech- Can you please explain the difference between 'standard' and 'cold type' plugs? Also, why does the Infinity parts machine now recommed the use of the 'cold type' plugs in J30s?

[maxnix]

Plug temperature realted to how the insulator is constructed, and thus how much heat is conducted away from the combustion chamber and into the head where the coolant will carry the heat away to the radiator.

A "colder" heat range plug will conduct more heat away (less insulator in the combustion chamber). Usually this is recommended for higher engine RPM operation or in hotter climates. Check the NGK site for a chart on their plugs, or do a search on this previously covered topic.__________________Brian1995 Q45 & Q45t & 2000 Q45

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[Eswift]

It just seems like a waste to change plugs with so few miles on them. But oh well, I guess it is better to be safe than sorry.

I changed mine recently at 100k (never having been changed before in the life of the car) and the old ones were almost as clean as the new ones.

my point is, the engine runs so well that its almost a waste to ever change the plugs. Not that i recommend that, because I don't, it just is a testament to the solid engineering behind this powerplant.

side note, noetic: the 6G's should work fine for you.

the move to a colder plug is most likely just a preventative measure for these engines...the avg mileage surely is above 80k now for all J30s. carbon build up here and there is an insulator in other parts of the combustion chamber, and the cold plugs may relieve some of these effects.

just a guess.