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Using anti-seize on spark plugs or not #4599962
12/10/17 02:59 PM
12/10/17 02:59 PM
Joined: Dec 2014
Posts: 51
Georgia
Electromotive Offline OP
Electromotive  Offline OP
Joined: Dec 2014
Posts: 51
Georgia
When installing spark plugs on a Ford F 150 equipped with the 300 inline six engine should I use a little anti-seize on the threads or not? The plugs for this engine don't have many threads on them, maybe six or seven full threads at most, unlike some other plugs. (NGK recommends not using anti-seize when installing plugs)

Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4599966
12/10/17 03:06 PM
12/10/17 03:06 PM
Joined: Jul 2009
Posts: 750
texas
danez_yoda Offline
danez_yoda  Offline
Joined: Jul 2009
Posts: 750
texas
A very little. Just a film in the threads is all you need. Torque by feel. Seated plus however much turn they tell you.

Last edited by danez_yoda; 12/10/17 03:08 PM.
Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4599990
12/10/17 03:29 PM
12/10/17 03:29 PM
Joined: Jul 2005
Posts: 31,009
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 31,009
NY
Originally Posted By: Electromotive
When installing spark plugs on a Ford F 150 equipped with the 300 inline six engine should I use a little anti-seize on the threads or not? The plugs for this engine don't have many threads on them, maybe six or seven full threads at most, unlike some other plugs. (NGK recommends not using anti-seize when installing plugs)


There are several threads a year on this topic, some people are for it some against it. I've always used it, including NGK plugs.

Regarding the 300 I6, I have owned vehicles powered with that engine since 1984, and still own one. I've used anti-seize on the plugs in every one of them until today. With Autolite and NGK plugs, never a problem. I live on Long Island where corrosion can be an issue.


God Bless Our Troops

Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4599992
12/10/17 03:31 PM
12/10/17 03:31 PM
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
Never done it. I hand tighten the plugs using a socket/extension and then give 1/2 turn with the ratchet to snug and that is good enough. Even after 100K miles.

Last edited by StevieC; 12/10/17 03:32 PM.

'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600005
12/10/17 03:41 PM
12/10/17 03:41 PM
Joined: Dec 2006
Posts: 8,057
Canuck living in California
KrisZ Online content
KrisZ  Online Content
Joined: Dec 2006
Posts: 8,057
Canuck living in California
I use anti seize, however we've had countless discussions about thus topic over the years and I would say the split is always pretty much 50/50. I would toss a coin and move on.


2015 Dodge Grand Caravan-27k miles.
2006 Mazda 3-163k miles
Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600012
12/10/17 03:45 PM
12/10/17 03:45 PM
Joined: Oct 2014
Posts: 12,597
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,597
Idaho
I had a 1979 Ford F150 with the 300 Ci 6 and it had 300,365 mile on it with normal oil pressure when I sold it. I put a oil pressure gauge on it. I used antiseeze on the plugs. It was one of my favorite engines


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600026
12/10/17 04:06 PM
12/10/17 04:06 PM
Joined: Jun 2003
Posts: 33,595
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,595
ME
Iron head= less threads.

I'd let it be your call, but remember, most plugs have a plating on them already.

If you gotta do it, don't let the stuff foul the electrode.

Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600047
12/10/17 04:32 PM
12/10/17 04:32 PM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
The consensus appears to be a toss-up.

The real problem with using the stuff and why some manufacturers say "no" is that people use too much.

Also, clean is very important, along with proper torque.

Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600049
12/10/17 04:33 PM
12/10/17 04:33 PM
Joined: May 2016
Posts: 720
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 720
Canada


After removing plugs from a well kept GM V6 3.5, the threads were very tight, very dry
8 yr old original iridium plugs.

I wonder what they did at the engine plant! Yes, there was lots of thread engagement and
I did use a thin even coating.

One key step I do every year for FWD V6s and RWD V8s, I always use compressed air and extra long
nose air gun to blast dirt out of the spark plug wells so it can't fall into the threads when the plugs
are finally replaced! Doing it every year means no dirt gets a chance to cake-on and break off
at the last minute while the plugs are worked on!

Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600065
12/10/17 05:05 PM
12/10/17 05:05 PM
Joined: Dec 2003
Posts: 2,208
Chicago IL
ChiTDI Offline
ChiTDI  Offline
Joined: Dec 2003
Posts: 2,208
Chicago IL
They do make a high temp anti seize for diesel injectors, or they did back when I owned one.
Might be something to consider.

Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600067
12/10/17 05:13 PM
12/10/17 05:13 PM
Joined: Jul 2013
Posts: 414
D/FW Metroplex
The_Nuke Offline
The_Nuke  Offline
Joined: Jul 2013
Posts: 414
D/FW Metroplex
I have never seen the need to use anti-seize on my spark plugs. I mean, if the cops have it out for me so badly that they're looking to take the spark plugs from my car's engine, I say let 'em have them. If they're that intent on messing with me, a little anti-seize ain't gonna stop them from taking my stuff.

Heck, if anything, it might make them mad that they had to go to the trouble of inventing an excuse to confiscate my stuff, thereby causing them to be extra vengeful in their seizure tactics.

Best just to acquiesce and move on IMHO!


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 2.62 (215mm)
Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600070
12/10/17 05:20 PM
12/10/17 05:20 PM
Joined: Oct 2006
Posts: 877
Ohio
2oldtommy Offline
2oldtommy  Offline
Joined: Oct 2006
Posts: 877
Ohio
The best product I have found for anti seize is powered graphite. The kind that is sold for lock lubrication. Place a small quantity lengthwise on the plug threads and gently rub. It is a conductor so that it does not interfere with conductivity and is not effected by heat. Don't worry about getting some in the combustion chamber, as it is compatible with engine oil. FWIW

Oldtommy

Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600076
12/10/17 05:28 PM
12/10/17 05:28 PM
Joined: Nov 2015
Posts: 346
East Tennessee
Starman2112 Offline
Starman2112  Offline
Joined: Nov 2015
Posts: 346
East Tennessee
Nope, I always install them dry with the engine cold and torque to spec.


2018 Toyota Tacoma SR5 2.7L, Mobil 1 AFE 0W-20, OEM filter
2010 Toyota Camry LE 2.5L, Mobil 1 AFE 0W-20, OEM filter
1998 Nissan Frontier XE 2.4L, Castrol GTX HM 5W-30, M1 filter
Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600077
12/10/17 05:28 PM
12/10/17 05:28 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
I use a light oil like Tri-Flow.


Re: Using anti-seize on spark plugs or not [Re: Electromotive] #4600079
12/10/17 05:30 PM
12/10/17 05:30 PM
Joined: Apr 2015
Posts: 289
Georgia
Charlie2015 Offline
Charlie2015  Offline
Joined: Apr 2015
Posts: 289
Georgia
There are two questions I have: 1) Did the plugs have anti-seize from the factory? and 2) What does the plug manufacturer recommend?


1998 Honda Accord EX 2.3L Auto (Sold) 214k mi
2009 Scion tC Manual (Daily Driver) 165k mi
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