Spark Plugs
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,101
From: Fulshear, TX
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
^ I agree as no reason I can think of to go with anything other than what the maker specifies. You must have a ton of miles on her.
Last edited by Kevin A Jones; Mar 24, 2019 at 04:04 PM.
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,101
From: Fulshear, TX
I'm doing mine @ 43k miles since my car is now 5 years old. Not called for until 100k, but no harm in staying ahead of the curve is my thought to make sure it keeps running like new.
Thread Starter
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
I have about 93,500 miles on it! I'll take the plugs in with my next oil change and have them replace them. The dealership here in Lake Havasu let's me bring my own parts in. Some items, as I'm sure you are well aware of, are significantly less expensive than at a dealership. They don't mind.
Team Owner
Joined: Sep 2010
Posts: 32,042
Likes: 4,610
I haven't had to change spark plugs in 30 years.
All my cars and RVs, have been diesels !! 
..I'm with Krackah! Get em, and plug wires on Amazon/ Internet.
All my cars and RVs, have been diesels !! ..I'm with Krackah! Get em, and plug wires on Amazon/ Internet.
Last edited by Skid Row Joe; Mar 24, 2019 at 04:51 PM.
Intermediate
Joined: Jul 2017
Posts: 47
Likes: 21
From: loris sc
Careful here; for some reason the plug wires are an art to put on where they will stay. . I've had twice to come off. Of course on the right bank which is a real hassle to get to. Definitely let a vette tech do it. Dale
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
I have about 93,500 miles on it! I'll take the plugs in with my next oil change and have them replace them. The dealership here in Lake Havasu let's me bring my own parts in. Some items, as I'm sure you are well aware of, are significantly less expensive than at a dealership. They don't mind.
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Racer
Joined: May 2018
Posts: 266
Likes: 95
From: USA
First of all the plugs don't look foul, i would recommend pull the plugs clean with small heat Torch gap at .035 Its not your Wires , find a good used coil that you know that works don't install thoses Delco Repro. made in China there junk and see what happens.
Thread Starter
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Team Owner
Joined: Sep 2000
Posts: 25,008
Likes: 2,707
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Talking to the tech at our previous dealership, I asked how the plugs on the C5/C7 looked when they were changed.
He said at 50k they still looked good, at 100k they definitely need to be changed.
He said at 50k they still looked good, at 100k they definitely need to be changed.
Team Owner
Joined: Jul 2004
Posts: 28,431
Likes: 3,284
From: Hartford WI
IDK. Most of the cost of the plug replacement is already paid for with the labor. Retail at Autozone is under $9 assuming no rebate. What would the point be of dragging it to 100K? I really don't like to leave plugs in that long especially with cars that aren't driven very much. Over the years, I have never done a stuck spark or glow plug that didn't require some sort of head work.