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#4599962 - 12/10/17 02:59 PM Using anti-seize on spark plugs or not
Electromotive Offline


Registered: 12/10/14
Posts: 50
Loc: 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)

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#4599966 - 12/10/17 03:06 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
danez_yoda Offline


Registered: 07/18/09
Posts: 471
Loc: 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.


Edited by danez_yoda (12/10/17 03:08 PM)

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#4599990 - 12/10/17 03:29 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
demarpaint Offline


Registered: 07/03/05
Posts: 29802
Loc: 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.
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#4599992 - 12/10/17 03:31 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
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.


Edited by StevieC (12/10/17 03:32 PM)
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#4600005 - 12/10/17 03:41 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
KrisZ Offline


Registered: 12/23/06
Posts: 7475
Loc: Toronto, Canada
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.
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#4600012 - 12/10/17 03:45 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
CT8 Offline


Registered: 10/09/14
Posts: 11018
Loc: 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
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#4600026 - 12/10/17 04:06 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
eljefino Offline


Registered: 06/15/03
Posts: 32671
Loc: 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.

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#4600047 - 12/10/17 04:32 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: 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.

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


Registered: 05/19/16
Posts: 706
Loc: 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!

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#4600065 - 12/10/17 05:05 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
ChiTDI Offline


Registered: 12/19/03
Posts: 2202
Loc: 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.

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#4600067 - 12/10/17 05:13 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
The_Nuke Offline


Registered: 07/21/13
Posts: 295
Loc: 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!
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#4600070 - 12/10/17 05:20 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
2oldtommy Offline


Registered: 10/29/06
Posts: 873
Loc: 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

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#4600076 - 12/10/17 05:28 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
Starman2112 Offline


Registered: 11/27/15
Posts: 313
Loc: East Tennessee
Nope, I always install them dry with the engine cold and torque to spec.
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#4600077 - 12/10/17 05:28 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
I use a light oil like Tri-Flow.


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#4600079 - 12/10/17 05:30 PM Re: Using anti-seize on spark plugs or not [Re: Electromotive]
Charlie2015 Offline


Registered: 04/24/15
Posts: 243
Loc: 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?
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