Just curious how long have people went or would go on the stock platinum plugs gm uses (ac delco?)?
How long would you go on GM Platinum plugs?
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Usually the car is falling apart anyways... Why worry about the plugs in a GM?
(J/K)
I wouldn't go further than 60K miles (100K KM's) on Platinum.
I wouldn't go further than 60K miles (100K KM's) on Platinum.
85K - 100K no problem
On Platinums? Not on Iridiums, but Platinums? I have never witnessed a car go that far on Platinums. Usually by 100K KM (60K miles) they are worn out.
Maybe we have stuff in our winter fuels that contribute to wear?
Maybe we have stuff in our winter fuels that contribute to wear?
GM platinum will last 100,000 miles. If not sure, remove one that is easy to get at. When you replace, use the AC Delco Iridium, they will last much longer, plus the iridium tip provides a better spark. I only use iridium - Denso, NGK, Champion, and AC Delco are best, Autolite XP is cheap, they also work, but watch the gap on XP, examine the tips in the store BEFORE you buy - the ground electrode is often off centre, and requires bending with the gapping tool to line up.
Originally Posted By: Corvette Owner
85K - 100K no problem
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+1. The Delcos I pulled out of the Montana at ~97k looked good.
85K - 100K no problem
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+1. The Delcos I pulled out of the Montana at ~97k looked good.
I have Iridium plugs from the OEM and I have a set I bought myself. Every 34K miles I swap them out. Not because I want to get them out of their because they are no good......Iridiums are good even longer then platnium. I do this because I have aluminum heads and do not want to have them get stuck in the head.I have seen spark plugs left in for 120,000 miles that basicly ruined the head trying to get them out.
Patman
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When I got my 98 Corvette it only had 32k on it and I took it to get dyno tested almost right away. When hooked up to a scan tool it was showing 7 degrees of knock retard so they pulled a plug to check and found it was [censored] the platinum "puck" on it and therefore the gap was way over spec. I ended up changing all 8 plugs and most of them were missing these pucks! After changing the plugs we made another dyno pull and immediately picked up more than 10 rwhp and the knock retard on the scan tool went to zero. So I would never attempt to go 100k on these plugs (not if they are of the same design as the ones I had in my car)
111K in my 03 Tahoe here.
Patman - I can't figure out how a wide spark plug gap would cause the microphonic/vibration induced spark knock sensor to activate.
Okay, maybe you've never seen it, but my Aerostar went well over 100K on the OEM plats (actually half-plats), and while they had a pretty wide gap at removal, the Vulcan was still running just fine.
So, yes, you can trust the OEM WRT spark plug life.
So, yes, you can trust the OEM WRT spark plug life.
We went 95k and noticed no difference when we changed them.
I changed them out of my GP at 95,000 and they still looked good.
I changed them out of a 98 4.3 blazer with 112,000 miles on it and 2 of the platinum ground pads were missing.
I changed them out of a 98 4.3 blazer with 112,000 miles on it and 2 of the platinum ground pads were missing.
I removed the irridium plugs from my last Lexus (rx330) at about 120-125k. Should have left them in to at least 150k as they were like new. But I do use fuel systems cleaner every 20-30k.
Originally Posted By: Patman
When I got my 98 Corvette it only had 32k on it and I took it to get dyno tested almost right away. When hooked up to a scan tool it was showing 7 degrees of knock retard so they pulled a plug to check and found it was [censored] the platinum "puck" on it and therefore the gap was way over spec. I ended up changing all 8 plugs and most of them were missing these pucks! After changing the plugs we made another dyno pull and immediately picked up more than 10 rwhp and the knock retard on the scan tool went to zero. So I would never attempt to go 100k on these plugs (not if they are of the same design as the ones I had in my car)
This is what I have seen several times before, the platinum tab on the ground electrode had fallen off and opened up the gap. I never seen the platinum plugs actually worn out but that tab fall off. I wonder if the iridiums avoid doing that?
When I got my 98 Corvette it only had 32k on it and I took it to get dyno tested almost right away. When hooked up to a scan tool it was showing 7 degrees of knock retard so they pulled a plug to check and found it was [censored] the platinum "puck" on it and therefore the gap was way over spec. I ended up changing all 8 plugs and most of them were missing these pucks! After changing the plugs we made another dyno pull and immediately picked up more than 10 rwhp and the knock retard on the scan tool went to zero. So I would never attempt to go 100k on these plugs (not if they are of the same design as the ones I had in my car)
This is what I have seen several times before, the platinum tab on the ground electrode had fallen off and opened up the gap. I never seen the platinum plugs actually worn out but that tab fall off. I wonder if the iridiums avoid doing that?
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