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2004 Gs 300 Service Question, Spark Plugs

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I have a printout of the service history (Lexus Oxford) for my 2004 GS 300. By the look of it the Spark Plugs were changed at 68,000 miles. The service at that time was a 'Full 60,000 miles / 4 Year Service'.

The car is now on 133,000 miles and runs well. Under the bonnet is a sticker stating that only iridium Spark Plugs must be used. As the service was at a Lexus dealer I guess these were fitted.

What I'm interested in is the lifetime of these plugs. Any advice welcome, I plan on keeping the car for another 40,000 miles.

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According to the service schedule they should be changed every 60k. If the engine is running fine and fuel consumption is ok then I would leave them alone. Don't take them out and clean/adjust them though.

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Thanks Gents.

I've asked Lexus to quote for replacement.

Their quote for the O2 sensors was quite high and in the end I did them myself. I think this job however is a Royal PITA so can't see myself doing it.

Fuel consumption is quite good and it runs very well.

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