My Orginial spark plugs at 85k
#1
Pit Crew
Thread Starter
My Orginial spark plugs at 85k
Yeah I know Lexus recommends changing the spark plugs on the GS every 60k but I’m just changing mine at 85k.. for these to be the orginial spark plugs at this mileage they actually don’t look bad. This is my 5th GS I hardly change them at 60k never had a problem. I also changed my drive belt since the mechanic is under the hood.
#5
Pit Crew
Thread Starter
I thought the samething whats weird about it is that even on my 07 and 08 GS350 they look the same. I'm on my 5th GS now and for some reason they always look like that when they are removed. Its dry to the touch, the tech said everything was good nothing to be concerned about.
#6
Pit Crew
Thread Starter
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#8
Lexus Test Driver
Those spark plugs look good. They looked like that at 10,000 miles and they'll look just as good at 150,000 miles.
#9
Pit Crew
Thread Starter
#10
Instructor
look good
should have been changed 15000 miles ago
the small difference in fuel economy would have paid for the parts
good luck
should have been changed 15000 miles ago
the small difference in fuel economy would have paid for the parts
good luck
#11
Lexus Test Driver
The following 2 users liked this post by bclexus:
jonathancl (12-31-18),
Knucklebus (12-31-18)
#12
Instructor
Just because Iridium plugs can "last" 160k doesn't mean the performance won't degrade over time. The electrodes don't just disappear in an instant once it ticks over 160k. Computers in modern cars can compensate for minor gap changes, but it comes at the cost of performance or fuel economy. We are talking about very fine tolerances here.
I had Iridium's from factory on my Civic Si. After 100k km, I changed out the plugs and they were at 0.06"(factory spec 0.043"). There was noticeable power difference and I got an improvement of 1L-1.5L per 100km. They too, "looked" perfectly fine. Only a feeler gauge would tell you the width changed.
I had Iridium's from factory on my Civic Si. After 100k km, I changed out the plugs and they were at 0.06"(factory spec 0.043"). There was noticeable power difference and I got an improvement of 1L-1.5L per 100km. They too, "looked" perfectly fine. Only a feeler gauge would tell you the width changed.
Last edited by er34; 12-30-18 at 05:29 PM.
#13
Lexus Test Driver
Just because Iridium plugs can "last" 160k doesn't mean the performance won't degrade over time. The electrodes don't just disappear in an instant once it ticks over 160k. Computers in modern cars can compensate for minor gap changes, but it comes at the cost of performance or fuel economy. We are talking about very fine tolerances here.
I had Iridium's from factory on my Civic Si. After 100k km, I changed out the plugs and they were at 0.06"(factory spec 0.043"). There was noticeable power difference and I got an improvement of 1L-1.5L per 100km. They too, "looked" perfectly fine. Only a feeler gauge would tell you the width changed.
I had Iridium's from factory on my Civic Si. After 100k km, I changed out the plugs and they were at 0.06"(factory spec 0.043"). There was noticeable power difference and I got an improvement of 1L-1.5L per 100km. They too, "looked" perfectly fine. Only a feeler gauge would tell you the width changed.
#14
Instructor
interesting thoughts
for those readers that enjoy performance and fuel economy
change your air filter every third oil change or 20-25 k and your plugs at 60-70
for those readers that enjoy performance and fuel economy
change your air filter every third oil change or 20-25 k and your plugs at 60-70