yeah the plugs looked completely fine, they probably had another 50k miles in them. it'll probably be 10 years before i ever replace mine again.
some fluids maintenance as well:
i prefer to run a 0W-40 synthetic weight instead of any 5W-30. i think most Mobil oils are garbage, but their 0W-40 formulation is great for our cars, because it shears down to about a "35" weight but holds that viscosity for a really, really long time (its also cheap and easy to find). great for extended intervals in hot temps with confidence. where i live, it gets extremely hot and i drive the car hard all the time but the 0W cold viscosity is great for winter temps too.
i decided after my last change to send it to Blackstone Oil Labs for an analysis to fully understand if my oil choice was in fact a good one. the results came back great. i ran the oil monitor down to 0% plus another couple hundred miles.
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minimal trace elements in the oil (particularly lead/copper/chromium which is your bearings and rings), low silicon so the OEM air filter is working well, low insolubles so the Honda A01 oil filter is doing its job. the cSt viscosity shows that the 0W-40 dipped into 30 weight range by 6600 miles which is right where i wanted it. it can easily handle 8,000 mile changes.
also, for everyone who wants to chime in with "but the oil cap says 5W30!" , the K20 is spec'd in the US for 5W-30, but Honda's JDM K20A calls for a 5W-40 weight in the factory service manual. Given that the engine in that is almost identical internally to our K20Z3's, supported my thought that the engine would be happy with a 40 weight oil and that our cars are probably spec'd for a 5W-30 for gas mileage and emissions reasons.
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i'm currently running Pennzoil Platinum Euro 0W-40 synthetic and will do another analysis on that after the next oil change.