Re3iRtH

The last (2nd owner) only had the car for like a year and is not sure
whether spark plugs were replaced. All of the recalls have been performed
by the main owner, as well as the exterior being in phenomenal shape for an '06.

Car has ~85k miles now. Its hard to put more than 8-9k miles per year here, so I wanted
to see if I can push it to like 100k miles, or is there any way I can just pop out 1 plug and
check if it looks old or new. I remember one owner on here said they went like ~120k.

BoyOhBoy

iTrader: (9)

For the IS250, you should change it at 60k because of the carbon build up issue. So I'd imagine the 350 to go to 90-100k

Re3iRtH

Thanks! Anyone with first hand experience changing them after 100k miles? Would
love to hear your report.

jamespoco

iTrader: (1)

I have a 06 is350 and when I had mine changed at 67xxx , the spark plugs looked really ugly and the tip was worn out

WhatYaGot

I changed mine @ 90K. Car was running fine, but didn't want to wait to have any performance problems

Ants350

iTrader: (1)

I change em now did mine at 94k.. 2 plugs look pretty shot! You might pop one out and it may look fine but who knows about the others..

Re3iRtH

That's what I was wondering. Would taking out the easier one to remove, be representative
of the rest. Basically, would I be able to tell if they are original factory or changed at 60k.

JP250

Just curious, what are the consequences for not changing your spark plugs besides lower gas mileage, loss of performance, etc...? Does the engine really build more carbon if you don't change the spark plugs?

dfwjohnd

iTrader: (6)

I changed mine @ 44k, car idled and ran smoother. I bought the car used so I figured why not do it... Took 30 mins also very inexpensive

Re3iRtH

It took you 30 minutes? Are you sure...
I think it would take a pro mechanic at a dealership
with full set of tools longer than that.

Ants350

iTrader: (1)

I say do it for piece of mind if you plan on keeping car for a while.

pmanliu

iTrader: (4)

also curious to the answer of this question. I have 60k on mine and no real issues, except maybe a slighty lower MPG than normal (19 combined in NYC). Was thinking about changing them now but on the fence.

Gville350

iTrader: (10)

I had my plugs pulled @ 61k miles, and the plugs were in great shape. Replaced them with new OE plugs, and there was zero change in the performance or fuel mileage. Just a good prevenative maintenance thing regardless.

mrcupide2

My mechanic was a certified Toyota mechanic, I tired to change my spark plugs at 60 k and he told me that my spark plugs are good til AT LEAST 90k. IM at 70 K right now and will replace them at 90 k or if I start experiencing any misfire.

Re3iRtH

I appreciate the input guys. The main thing I was asking is if there is any particular plug
that I can easily pull and check how it looks, or would you guys just replace all of them for piece of
mind even in the case the 60k tune-up was already done.