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Discussion Starter #1
NGK seems to be the preference. Are there other variables like Platinum, Gold,etc. Do plugs actually wear out? What goes wrong? If I pulled one plug and its nice and brown with no corrosion is it good? Where do I find the correct gap sizes? I checked CarFax before I bought my 90,000 mile vehicle. No plug changes. But it looked like regular maintenance was performed ( a plus in my mind for a one owner auto) Maybe the dealer wasn't aware?
 

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2011 Outback 3.6R Limited 2013 Crosstrek Premium
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NGK platinum is factory and definitely preferable. Plugs nowadays with these fancy metals definitely last and work much better much longer. The metals will still corrode and the other internals of the plug will wear. I'm not scared to go 90000+ on platinum plugs. but you're thinking about it. About $13 a piece, DIY doable, peace of mind. Just do it. Gap should come preset but I usually check. My guess or memory serves in the .040 range but would have to check. Your engine 2.5 or 3.6?
 

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2008 OB Limited 2.5i, Portland OR USA
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4,990 Posts
My parameters are pretty simple:
  • they're supposed to be pulled and checked every 30k, even if they are specified to last longer
  • while you can re-use the longer life offerings that use noble metals, you still have to deal with the spark plug base sticking in the head if it's been removed and then re-torqued
  • so I just use the conventional spec plug and change them at the 30k intervals that they are checked at
I suppose I could use anti-sieze compound and re-torque, but at some point I question why I would bother, since the standard ones hold up very well to 30k.
 

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2011 Outback 3.6R Limited 2013 Crosstrek Premium
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To correct myself. Iridium not platinum is factory.
Gap .044

just noticed a new one I hadent heard of yet , ruthenium.
 

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Discussion Starter #7
NGK says ruthenium plugs are "high ignitability" plugs that guarantee maximum combustion efficiency to ensure the most complete fuel burn (reduced emissions), quicker throttle response, faster acceleration, smoother idle and better cold starting.
 

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2012 Outback Ltd 3.6r
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Just some additional fuel to the fire or discussion. NGK lists at minimum 6 different Iridium plugs for the 3.6, all at varying prices, even on Amazon. Some have narrow pointed tips, other have a wider more traditional plug tip. I'm not at around 68k and the mileage has come down a couple mpg from when it was bought, and I'm thinking of replacing come spring. (Of course the mileage might be a different fuel mix, as pumps now indicate up to a higher ethanol content the past year or so).

So who has tried which NGK plug, and how did they work in your 3.6?
 

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2013 3.6R Limited
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Still running the factory spark plugs in my 2013 3.6R, now at 54,500 miles. The plugs are still performing as well as ever. Per my owners manual, they are supposed to be NGK SILFR6C11 iridium plugs. I have never pulled one to check and given how difficult they are to get to, I do not plan to do so until it is time to install new ones.
 

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2011 Outback 3.6R Limited 2013 Crosstrek Premium
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I used the SILFR6C11. ember No issues. Satisfied with results. Too long ago to remember any improvement
 

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2011 Outback 3.6R Limited 2013 Crosstrek Premium
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NGK 7505 SILFR6C11 Laser Iridium Plug
SPARK PLUG​
NGK 7787 LFR6C-11 V-Power Plug
SPARK PLUG​
NGK 6619 LFR6AIX-11 Iridium IX Plug
SPARK PLUG​
NGK 93420 LFR6BHX Ruthenium HX Plug
SPARK PLUGS​
NGK 1483 LFR6CGP G-Power Plug
SPARK PLUG​
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Front​
Qty
NGO7505_0014154558
Qty
NGO7787_0014154500
Qty
NGO6619_0014260217
Qty
NGO93420_0130138041
Qty
NGO1483_0014154527
Part Number​
NGK 7505​
NGK 7787​
NGK 6619​
NGK 93420​
NGK 1483​
Product Line​
NGK​
NGK​
NGK​
NGK​
NGK​
List​
29.66​
10.78​
12.74​
20.18​
9.80​
Cost​
16.49​
5.68​
7.29​
11.49​
5.49​
Unit​
Each​
Each​
Each​
Each​
Each​
Features & Benefits​
NGK Laser Iridium spark plugs offer the best combination of performance and longevity. Actual OE or equivalent replacement spark plug.; Laser Iridium plugs are tested to the highest standards to ensure quality and durability. Engineered specifically for OE applications.; Iridium tipped center electrode provides durability six times harder than platinum. NGK’s high-grade pure alumina ceramic and 98% pure copper core prevents the spark plug from overheating while providing reliable starts.; NGK Spark Plugs (U.S.A.), Inc. is the largest OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist™. With over 80 years of automotive expertise NGK has built a reputation for quality and reliability; manufacturing spark plugs for virtually every automotive, motorcycle, marine and small engine application. We are committed to be the premier partner with our customers, while maintaining original equipment standards for the highest durability and operational performance. With state-of-the-art manufacturing, inventory and distribution facilities in North America and across the globe, NGK is dedicated to providing customers with world-class products and services.
Laser Series Difference
NGK V-Power spark plugs offer reliable performance and improved ignitability over standard nickel plugs. Actual OE or equivalent replacement spark plug.; The special V-cut center electrode and concave ground electrode of NGK's V-Power spark plug increases ignitibility. Engineered specifically for OE applications.; NGK V-Power spark plugs are tested to the highest OE standards. Trivalent metal plating eliminates the need for anti-seize. For even greater performance consider upgrading to a NGK Iridium IX Spark Plug.; NGK Spark Plugs (U.S.A.), Inc. is the largest OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist™. With over 80 years of automotive expertise NGK has built a reputation for quality and reliability; manufacturing spark plugs for virtually every automotive, motorcycle, marine and small engine application. We are committed to be the premier partner with our customers, while maintaining original equipment standards for the highest durability and operational performance. With state-of-the-art manufacturing, inventory and distribution facilities in North America and across the globe, NGK is dedicated to providing customers with world-class products and services.
G Power Difference
V Power Difference
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability.; NGK Iridium IX plugs offer extreme ignitibility and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response.; The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloys extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to a NGK RUTHENIUM HX™ plug.; NGK Spark Plugs (U.S.A.), Inc. is the largest OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist™. With over 80 years of automotive expertise NGK has built a reputation for quality and reliability; manufacturing spark plugs for virtually every automotive, motorcycle, marine and small engine application. We are committed to be the premier partner with our customers, while maintaining original equipment standards for the highest durability and operational performance. With state-of-the-art manufacturing, inventory and distribution facilities in North America and across the globe, NGK is dedicated to providing customers with world-class products and services.
Iridium IX Difference
NGK Ruthenium HX™ spark plugs are the best in class plug on the market for today’s modern vehicles. NGK's patented Ruthenium technology offers the highest performance and life expectancy of any Aftermarket spark plug line.; Created from advanced OE technology as a high ignitability plug. RUTHENIUM HX™ spark plugs come with patented specialized OEM DFE and PSPE® tip designs to meet the demands of modern engines.; NGK Spark Plugs (U.S.A.), Inc. is the largest OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist™. With over 80 years of automotive expertise NGK has built a reputation for quality and reliability; manufacturing spark plugs for virtually every automotive, motorcycle, marine and small engine application. We are committed to be the premier partner with our customers, while maintaining original equipment standards for the highest durability and operational performance. With state-of-the-art manufacturing, inventory and distribution facilities in North America and across the globe, NGK is dedicated to providing customers with world-class products and services.
HX Advantage
HX Difference
NGK G-Power Platinum spark plugs are the best single platinum plug at an economical price. G-Power plugs have a fine wire platinum center electrode that provides excellent performance and fuel efficiency.; The NGK G-power Platinum plug has a trapezoidal cut ground electrode that offers increased durability over the conventional nickel plug and improved fuel efficiency, lower emissions, faster starts and quicker acceleration.; NGK Spark Plugs (U.S.A.), Inc. is the largest OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist™. With over 80 years of automotive expertise NGK has built a reputation for quality and reliability; manufacturing spark plugs for virtually every automotive, motorcycle, marine and small engine application. We are committed to be the premier partner with our customers, while maintaining original equipment standards for the highest durability and operational performance. With state-of-the-art manufacturing, inventory and distribution facilities in North America and across the globe, NGK is dedicated to providing customers with world-class products and services.
V Power Difference
Brand​
NGK​
NGK​
NGK​
NGK​
NGK​
Contents​
Iridium tipped spark plug w/gasket​
Nickel w/ V-groove tipped spark plug w/gasket​
Iridium tipped spark plug w/gasket​
Ruthenium HX tipped spark plug w/gasket​
Platinum tipped spark plug w/gasket​
Electrode Core Material​
Copper​
Copper​
Copper​
Copper​
Copper​
Gap Size​
0.044 in​
0.044 in​
0.044 in​
0.032 in​
0.040 in​
Hex Size​
5/8 in​
5/8 in​
5/8 in​
5/8 in​
5/8 in​
Manufacturer​
NGK Spark Plug​
NGK Spark Plug​
NGK Spark Plug​
NGK Spark Plug​
NGK Spark Plug​
Manufacturer Part Number​
SILFR6C11​
LFR6C-11​
LFR6AIX-11​
LFR6BHX​
LFR6CGP​
Seat Type​
Flat​
Flat​
Flat​
Flat​
Flat​
Spark Plug Heat Range​
NGK6​
NGK6​
NGK6​
NGK6​
NGK6​
Spark Plug Hex Size​
5/8 in.​
18 mm​
5/8 in.​
5/8 in.​
3/4 in.​
Spark plug Inductive​
No​
No​
No​
No​
No​
Spark Plug Reach​
26.5 mm​
26.5 mm​
26.5 mm​
Gasket​
26.5 mm​
Spark Plug Resistor​
Yes​
Yes​
Yes​
Yes​
Yes​
Spark Plug Resistor Value​
5000​
5000​
5000​
5000​
5000​
Spark Plug Seat Type​
Gasket​
Gasket​
Gasket​
14 mm​
Gasket​
Spark Plug Thread Size​
14 mm​
12 mm​
14 mm​
14 mm​
Terminal Type​
Solid​
Solid​
Solid​
Solid​
Solid​
Thread Size​
M14-1.25​
M14-1.25​
M14-1.25​
M14-1.25​
M14-1.25​
UNSPSC​
26101732​
26101732​
26101732​
26101732​
26101732​
VMRS Code​
033003005​
033003005​
033003005​
033003005​
033003005​
 

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Discussion Starter #13
Let me weigh in. Spark is spark, right? If it ignights the fuel, the source shouldn't matter, should it?
 

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2008 OB Limited 2.5i, Portland OR USA
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4,990 Posts
Let me weigh in. Spark is spark, right? If it ignites the fuel, the source shouldn't matter, should it?
Let me guess that perhaps you're of my generation, wherein a spark plug life of 15,000 miles using leaded fuel was considered pretty good? That does tend to lower the bar a bit.

I now have higher standards, but to a degree, I do agree with your point. If I have to be pulling plugs every 30k for inspection anyway (and everyone should be doing this, BTW, regardless of recommended change interval), I'm going to change them out at the same time rather than reinstall them and risk seizure. And if I change them, I'm just going to go with the minimum NGK FR5AP-11, at $7 on a bad day on Amazon, rather than some $30 noble metal exotic that someone claims does better.
 

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486 Posts
when you change them, go under the car to get them, while you can get them from the top it looks to be a lot easier to do these from the bottom.
 
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