Spark plug change interval?
#1
Intermediate
Thread Starter
Spark plug change interval?
Lexus told me 120K. I also read 60K. I know if you leave plugs too long it is not good, so maybe 90K?
I also read Denso TTs (IK20TT) for this car only last 30K. That is getting into copper territory.
I also read Denso TTs (IK20TT) for this car only last 30K. That is getting into copper territory.
#4
Intermediate
Thread Starter
I pulled a plug and the gap is moving toward .05. I think it could do a bit better in the idle quality and MPG dept. I get 16 short trip street only driving. Power seems fine but there is always room for improvement! Also planning on a TB cleaning. I cleaned the MAF and there is some improvement.
Still debating the OEM FK20HBR11 vs the IKBH20TT. They are long life plugs vs the thinner TTs. I read they only get 30k, in some cases though 100K, I have the TT in other cars and they are great. Ford uses a very thin finewire platnium plug and it is lasts 100k. I put the TTs in an older Explorer, I can tell a difference in power and idle quality. The plugs I replaced weren't old and went into another car. They are a great plug, but DI could be more wear and tear.
I am afraid to buy from Anywhere but Advance Auto (they are a Denso Dealer, on the site) because of counterfeits. They also have the best price.
Out the door with discounts and tax:
$32 for the IK
$83 for the FK
Rockauto is cheapest for the FK at 71.29 shipped. They use warehouses and Denso plugs are a big counterfeit item. Some fakes now are indistinguishable. Lexus said they had cars come back over fake plugs, even if done in a professional shop. They told me to buy from us or Advance. They said they use the IK if the customer has an issue with price but they aren't sure if it will last 120k. I see you can buy copper plugs too for $1 a plug :lol:. They may work better than the IR ones if you change them often. Copper is a great conductor.
#6
2006 GS 430, 155k miles, original plugs. Car drives great, pulls hard and gets a combined 23 mpg in city/highway. Should i be looking to change the plugs? What's the worst that could happen if i don't?
#7
Poor performance and mpg for starters, but it appears you’re not suffering those issues so drive on brother, drive on
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#9
I've heard from lexus it's 60k intervals although I'd argue that may be overkill, I've talked to many service advisors who have seen Toyota/lexus with the original plugs and over 200k on them still running fine. I didn't notice a difference really when I changed mine. id say every 90-100k is fine
#10
Intermediate
Thread Starter
I've heard from lexus it's 60k intervals although I'd argue that may be overkill, I've talked to many service advisors who have seen Toyota/lexus with the original plugs and over 200k on them still running fine. I didn't notice a difference really when I changed mine. id say every 90-100k is fine
#11
Pole Position
never have understood the mentality of delaying cheap maintenance. Oil changes, plugs, filters, fluid changes, coolant changes, etc....are ALL cheap. In fact, VERY CHEAP in comparison with having a failure fixed by a Lexus shop. If the book says change ANY of those items at a recommended interval, then just do it. Why push it plug to 120k freaking miles when they are less than the cost of a decent meal out?!!
#12
Lead Lap
never have understood the mentality of delaying cheap maintenance. Oil changes, plugs, filters, fluid changes, coolant changes, etc....are ALL cheap. In fact, VERY CHEAP in comparison with having a failure fixed by a Lexus shop. If the book says change ANY of those items at a recommended interval, then just do it. Why push it plug to 120k freaking miles when they are less than the cost of a decent meal out?!!
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ServerTech (02-02-19)
#13
That's why I asked what could go wrong. Timing belt -- won't take any chances. Oil changes, every 5k miles. But if the only possible harm of not changing the plugs is poor performance or mpg, well, the car will let me know when it's time and I don't need to follow a maintenance schedule.
Now, if there's a possibility of a misfire and damage to the exhaust, well then that's a different story.
Now, if there's a possibility of a misfire and damage to the exhaust, well then that's a different story.
#14
Driver School Candidate
I just picked up a 2008 gs 350 3 weeks ago already have a new air filter,changed the oil and plan on doing the plugs I got it from a Toyota dealer with 123,xxx on the clock.i figured it should be broken in now.,lol excellent non smoker 1 car owner.just gotta figure if I can do the plugs or just take it to Toyota.the Supra was so much easier...
edit,just saw a video on it,it should be aasy!
edit,just saw a video on it,it should be aasy!
Last edited by Leechmon; 04-08-18 at 08:59 PM.
#15
never have understood the mentality of delaying cheap maintenance. Oil changes, plugs, filters, fluid changes, coolant changes, etc....are ALL cheap. In fact, VERY CHEAP in comparison with having a failure fixed by a Lexus shop. If the book says change ANY of those items at a recommended interval, then just do it. Why push it plug to 120k freaking miles when they are less than the cost of a decent meal out?!!