AronZ28

iTrader: (2)

I seafoamed the motor and changed the plugs 25k miles ago. I used the OEM A/C delco plugs which are good to "100,000" miles. I'm changing the coolant, tranny fluid, fuel filter, and oil this weekend. Wondering if I should seafoam while I'm at it. If I do the seafoam treatment, do I need to replace the plugs as well?

Torque_Wrench

iTrader: (13)

Seafoam the thing...it sure won't hurt anything. The "Foam" can only help!

daryl2cb@yahoo.com

iTrader: (2)

I would at least take the plugs out after the treatment and brake clean them off,
I do not care what the autoparts guy said, any one who keeps the same plug in there car for 100,000 miles is a moron. It is like that 10,000 mile oil, imagine what that would look like coming out, tar most likely. not a good idea. I change my plugs once a year. why not, it is the cheapest part, and it gives you decent information to moniter your cylinders.

Z's Z-28

i, being a parts guy myself (oreillys) do say that no plug last 100,000 miles. check them about every oil change and see how they are doing. on cars like ours, spend the 40 bucks every 6 months and buy new iridium plugs, it wont hurt the car at all. go ahead and seafoam it, that wont hurt either, and while your at it, look at ur diff fluid, maybe that wouldnt hurt to be changed either.

aaron653

iTrader: (1)

are you a betting man?

jimmypop13

iTrader: (17)

I would change the plugs after the seafoam. I just bought a Z28 with 60k miles on it and seafoamed it. Now I'm having a bad misfire at low rpms after startup. I have new plugs and wires but havn't had the time yet to change them.
-Chris

Quickin

There are alot of cases where cars do amazing things. Example: My stupid friend in college bought a brand new Honda Accord CRX. He drove it at college for 4 full years and made approximately 10 round-trip cross country trips back home to Oklahoma. He put well over 100,000 miles on it in those 4 years. He NEVER did any kind of maintenance at all on that engine. We changed the oil for him for the first time after almost 50,000 miles, he had no idea about oil changes. Air filter too, almost 50,000 miles. His spark plugs were never changed. He was a true male air head moron who now fly's a Boeing 757.


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c0ncEpT

iTrader: (4)

I don't think it would be very fun trying to get 100K miles plugs that have never been pulled before out of an aluminum head, but thats just me. Yes they might last that long, but for $2.00 a plug I don't mind changing them every 40-50K

AronZ28

iTrader: (2)

So I'll change the plugs as well. Should I bother with new plug wires? They have 25k on them, I think they'll be fine.

Looks like Saturday went from a 2 beer to a 6 or 7 beer day.

Also, what about the oxygen sensors? They are the orginal ones with 100k miles on them, car still has stock manifolds, EGR, AIR, and cats. I really don't want to mess with those, they're expensive little fuggers.

Torque_Wrench

iTrader: (13)

I'll have to agree! I even sell AC Delco plugs...and this whole 100,000 mile spark plug thing is Bollox! I change mine once to twice a year. It's nothing to pull one out every few months and look at it, so you can see if your rich or lean. The plug will tell you when it needs changing.

Torque_Wrench

iTrader: (13)

lol...make sure you got a 12 pack of Coors Light or some Corona's. Seriously...remember....DON'T REMOVE THE PLUGS IN A HOT ENGINE....ALWAYS WAIT UNTILL IT'S COOLED OFF!

Trust me on this one.

MdFormula350

iTrader: (4)

they do last that long because people have ran them that long, however I am sure performance most likely was slightly decreasing, due to oil build it and wear and tear. mine only had 14k miles on the original denso's and they looke horrible with pinging sparkles on them and oil. I seafoamed the car with those plugs and gm top end cleaned as well and the car still ran the same after doing it, however those plugs needed changing after being 6 years old.

I bought a/c delco iridiums and installed them when i did headers, however, going to go with ngk for my next change way down the road.

blownta00

if theres 25k on those plugs you might as well change them, i do mine about every year.

92slowmaro

iTrader: (22)

the plugs actually do last 100,000 miles. i have worked on plenty of cars that can prove this too you. a few bolt on ls1's as well. its gm's 100k service... spark plugs and wires. and removing them at 100k + is no problem. i do it all the time.

tee-boy

iTrader: (8)

Just b/c the plugs last 100K miles doesn't mean you won't see performance gains by changing them. My car I bought w/ 65K miles swas running 14.65 in the quarter. I changed plugs and wires and dropped that to a 14.05 w/ no other changes.

taintedmeat

iTrader: (1)

I've had my GC 0w30 in for nearly 9k now and it still looks fine

Changing it soon though

Wiz02

While anecdotal evidence is not worth a whole lot - I Seafoamed the top end of my '02 SS at 96K this weekend and afterwards the plugs were clean (the entire plug including the insulators were spotless and the Denso's had around a .060 gap. The electrode was very pointy - don't know if this is normal or due to wear.

Unfortunately, I should have pulled a plug and examined it before the Seafoam and after, but didn't stop to think about. I would add that people do this to the Seafoam sticky but does anyone scan through all pages of a 29 page thread?

Seafoam results: The idle smoothed out after the top end Seafoam, with the original plugs still installed. Moderate smoke - but I Seafoamed at night to avoid the neighbor's wrath so I can't really be sure of the "smoke level".

BTW - I was doing the 100K maintenance - and this is first time that the plugs were touched (I am the original owner) and the top end cleaned. Not to change the subject - but removing the plugs boots on the passenger side was the second biggest pain, next to getting all scratched up changing the #8 (pass rear) plug. How is everyone removing the boots?

2002_z28_m6

iTrader: (10)

I agree about trying to get plugs out of a car with 100K on them. My dad did that with his f250 and the hex broke off the plug and left the threads in the block.Im sure most modern cars will run with 100k stock plugs in them because a DIS ignition system can jump a 12 inch gap or more so ofcourse it will run. For the $16-$60 that plugs can cost I would change them at 25k in my opinion.

jeep0084

iTrader: (18)

i changed mine with 96000 on the clock, did headers and decided to change the plugs while i was in there, the plugs looked fine, not burnt or anything and the car ran the same with the new ones in, no change in power, if your worried about it and the car has alot of miles, changing the plugs will never hurt but the factory plugs i had were great through 96k, i am also trying out the new mobil one extended performance, i have a little over 4000 miles on that but im keeping a very sharp eye on it, i will probably change it soon anyway though because i think about it all the time

JonB

iTrader: (3)

When i seafoamed my car I had a bad misfire shortly after, changed the plugs and all was fine after that. I always kinda assumed it was the seafoam so I won't do it again till I need plugs.