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So just passed 217,000 miles on my '99 GS400 and still have the OEM plugs. Indy looked at them at 200,000 miles and said they were fine. In 17 years the car has never had a problem starting, starts on first turn every time. My only concern is, should I change them just as a precaution? I'm heading in for my second TB/WP change at 220,000 and could change them then, or wait since they are not causing me an issue.
OEM from factory, 217,000 on them? I say replace them, keep the originals and put them up for auction at a museum...
ok honestly. I say replace them (since they should be changed at no later than 20,000). Keep the originals. If the car runs worse, put the originals back in and keep rollin... For just a few bucks, replacing them is worth it. At the same time, replace the wires too; and if you have the extra money, replace the coils as well... I would bet you'll see a difference in performance and at the very least, fuel economy. Just because they look fine, doesnt mean they're working at 100%
That's pretty cool. The long life ones are rated at 100k miles. Still, I would put new ones in for peace of mind. While they still work fine, they may not be at 100% efficiency. Considering the low cost, it should be done.
Just wanted to provide an update, finally changed out the original OEM spark plugs at 224,318 miles. Had a second timing belt / water pump change a few months ago so all service is up-to-date.
We had a 1997 Ford truck that had 127k miles and original plugs and several of them broke off in the head while we were trying to get them out. I have no desire to ever go through that again.
OEM from factory, 217,000 on them? I say replace them, keep the originals and put them up for auction at a museum...
ok honestly. I say replace them (since they should be changed at no later than 20,000). Keep the originals. If the car runs worse, put the originals back in and keep rollin... For just a few bucks, replacing them is worth it. At the same time, replace the wires too; and if you have the extra money, replace the coils as well... I would bet you'll see a difference in performance and at the very least, fuel economy. Just because they look fine, doesnt mean they're working at 100%