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Old 03-11-2013, 02:26 PM
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rsg1963 rsg1963 is offline
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Join Date: Oct 2010
Location: SF Bay Area, California
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Vehicle: 2016 RAM 3500
Trim Level: Laramie
Color: Granite Crystal
Engine: 2016-20?? 409ci (6.7L) Cummins Turbo Diesel 385hp 900lb/ft (Aisin ASC69RC Automatic)
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Default Completed full spark plug change

Thought I would share my experiences with this weekends plug swap for anyone contemplating thier own. I am skipping details like "I removed the airbox..."
a) First of all, what came out of my 2010 truck were 16 NGK (92174) LZFR5C-11 and that's what went back in. The cheapest I found them was for $4.39 each at O'Reiley Auto parts.
b) The gap was perfect on each plug so no change there.
c) Accessing most of the plugs (as mentioned on this forum many times) was not hard except for a couple spots; One was the passenger-side rear where I found it easier to remove a two screw bracket that held a wire bundle.The other tough spot was by the brake booster (driver's side). Two sets of plugs are harder to get if you do not have a 4" extension. Most 3/8" extensions are 3" or 6". So I had to get creative with 1/4" extensions. Basically I dropped the socket into the plug hole, then followed with a short extension, then followed with a 1/4" to 3/8" adapter. Once loosened, I did the reverse one piece at a time. Installing the new plugs went the same way, one tool piece at a time.
d) The rest of the 10 plugs were completely uneventfull. I do not believe in anti-seize for plugs because it changes the torque to easily, and my old plugs with 50K miles on them, looked good on the threads that were exposed to combustion. (meaning they were not an issue to remove) But I do believe strongly in electrical grease which I applied to the plug ceramic and a bit on the boot before install.
e) While I hoped for some awesome change in performance, sound, idle....SOMETHING! I honestly do not notice any difference at all.

Final thoughts: I was suprised how lightly the screws were torqued on removing the coil packs and equally suprised how tough the initial breaking torque on removing the plugs was. After they broke free 1/16th of a turn, they all hand-threaded out super easy.
Hope this helps somebody!
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2016 3500 Laramie MC: Bilstein 5100's up front, 20" Fuel rims with 275/65-20 Micheline LTX MS/2 tires, Weathertec Floor mats, 45 gal RDS tank, Hensley TS3 hitch, Billet DEF and Diesel caps, DeeZee tailgate assist, Bull Ring retractable stake pockets, Amp Research steps, hybrid window tint.
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