PFR6G-11 or PFR5G-11 Plugs in the V6???

[shadow83]

My Mitsu manual and the Haynes manual says to use PFR5G-11 plugs, but the NGK site and all of the autoparts stores list PFR6G-11??

Anyone know why?

[fatal1]

on the ngk site it should list which ones are stock in the description area, they are the platinums

[shadow83]

They are both platinums but different P/Ns.

[fatal1]

after you type in the make and model these say right next to it stock replacement
http://www.ngk.com/more_info.asp?AAIA=1399002&pid=2974

[pinoyesv6]

couldn't explain to you why but my owners manual says PFR6G-11

[WarmAndSCSI]

The difference is the heat range. I would run the "6" plugs over the "5" plugs to avoid any pre-ignition problems.

[6G72gearhead]

I'm running an 8 heat range plug.

[GSpeed]

I know this is older post however, I've encountered the same situation as you Shadow83. I've a 02 Galant ES-V6 as well (62,000 miles), and the owners manual states to use the following plugs;
-NGK PFR5G-11
-DENSO PK20PR11
-CHAMPION RC10PYP4
The NGK site suggests to use PFR6G-11 as replacement (owner manual states PFR5G-11). I contacted NGK rep who states that Mitsubishi went to a hotter plug in 03. Perhaps our vehicles were manufactured late in 02? No reason as to why Mitsubishi installed a hotter plug in the same engine! I don't believe any changes were made in compression ratio, valve and piston design, cam etc., that would have needed a change in the plugs heat rating. Bizarre. I decided to remove one of the plugs and it was the CHAMPION RC10PYP4. I've decided to replace with the NGK PFR6G-11 plug.

[amdrocks]

i got the '6' for my tune up earlier this year.. i have a '00 GTZ

[GSpeed]

amdrocks, did you have the opportunity to remove one of the OEM plugs yourself to view? If so, what was the plug manufacturer & type?

[amdrocks]

it was the same plug i replaced it with..

[GSpeed]

Thanks for the follow up amdrocks. So the PFR6G-11 was OEM in your 2000. pinoyesv6, what year is your vehicle?

[amdrocks]

Yup, it was.. You are welcome =)

[hhp8008]

Just to be sure, both the PFR5G-11 & PFR6G-11 are basically the NGK Platinums just different heat ranges.

I did not know any of this information thanks.

[GSpeed]

Yes, different heat ranges. The higher a number, the colder the plug. At least with the NGK plugs.
I've included a link to NGK website for additional spark plug information;
http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp?mode=nml

[GSpeed]

Just a follow up. Had spark plugs, cap & rotor, timing belt, timing belt tensioner, timing belt tensioner pully, timing belt idler pully, main drive belt, power steering belt, lower radiator hose and coolant flush and fill (Mitsubishi Super Long Life coolant # MZ311986) done at dealership. I inquired about changing water pump and thermostat at this time and service manager stated it was not necessary! I thought that was odd since I thought water pump had to be removed to access timing belt and thermostat is located behind lower radiator hose. Anyway, I've included a link to photo of spark plugs removed (Champion CHAMPION RC10PYP4 ). There appears to be some carbon deposits and corona discharge / discoloration on porcelain part of plug. May be normal wear according to the following Spark Plug Wear Chart; http://www.ngkntk.de/Spark_plug_faces.694.0.html
Although Mitsubishi recommends change at 100,000 miles, wouldn't wait that long. Vehicle has 70,500 miles and very well maintained. Plugs were replace with NGK PFR6G-11 (Mitsubishi # MD313443), not the NGK PFR5G-11. Following is link to Heat range cross reference chart; http://www.championsparkplugs.com/glossaryImage.asp?imgID=722
Timing belt that was removed seemed to be in great condition as well.
Click following link to view plugs removed; http://i201.photobucket.com/albums/aa296/GSped/IMG_1281.jpg?t=1285027400

[GSpeed]

shadow83, didn't think to ask however, I see you have the same year vehicle (02 Galant ES-V6). Do you have the NGK PFR6G-11 plugs installed? If so, did engine idle / run rough afterwards? Did check engine light come on?
Again, thanks for taking the time to reply.

[GSpeed]

To follow up, had timming belt, plugs, cap & rotor changed at dealership. When car was picked up, inquired why Check Engine Light was on and idle was eratic. Service manager stated, "computer is learning and light should go out and idol become normal". Waited a few days and no change. Rescheduled to have vehicle brought back to dealership. Noticed #4 & #6 plug wires were crossed at distibutor cap. Corrected, however no change. Had scan tool hooked up (Advanced Auto) and code stated "random misfire". Went to start vehicle to bring to dealership and nothing. I checked and noticed battery cable was loose. Corrected and jumped, vehicle started. Here's the odd part. The Check Engine Light has gone out. Turned key to acc position to confirm it didn't burn out. Also, idle has improved as well. Is it possible that disconnecting battery corrected the problem or simply "masked" the issue that caused the condition?
- with regard to installing the NGK PFR6G-11 plug and not NGK PFR5G-11 plug. Contacted NGK and received the following reply;
"The PFR6G-11 is only one heat range colder than the PFR5G-11, so installing it should have no noticeable effect on the engine. It’s not cold enough to cause a fouling condition so you should be just fine. There is also no benefit to installing a colder plug either, although it shouldn’t hurt in this case".

[Corey2kG]

Just a question I just picked up some NGK Vpower plugs n I'm not a spark plug wiz so are those good?

Edit: I haven't installed yet got some things to to do then let the car cool down. So if they are not the right ones I can get the right ones.

[GSpeed]

Corey2kG, never used the NGK V-Power plug. From what I understand, these are the claims;
The V-Groove is a solid-copper Core plug that forces the spark to the outer edge of the ground electrode, placing it closer to the air/fuel mixture. This allows the spark to more quickly ignite the mixture, providing more complete combustion. V-Power Spark Plugs also require lower ignition firing voltage, resulting in quicker starts and easier cold weather starts throughout the life of the plugs.
I would install what was originally equipped, unless a condition exists that requires a different plug to be installed. Heat range is important. Your owners manual should state recommended plugs.

[Corey2kG]

So is this a bad thing or good thing??? It does get pretty cold here in the winter which coming up n I don't mind a quick start either haha.