Spark Plugs,Spark plugs - red line car parts

Spark plugs

Idk what spark plugs should i put in my van it has 5 of those triton motor spark plugs the other 3 were regular spark plugs. What spark plugs should i use

My car has 246000 miles.
My car has an automatic transmission.

– Spark plugs

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Spark plugs

What happens if spark plugs are not properly installed?

– Spark plugs

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Spark plugs

Why is it that Audi recommend you replace your spark plugs at 40k and vehicles like Honda / Acura. Recommend them at 100k do they use a cheaper plugs or is it over selling ?

– Spark plugs

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spark plugs

I thought I changed my spark plugs a couple years ago but a car reminder came up to replace them. Seems like the car is running fine but is there a way to check to see if I do need to replace them?

My car has 103000 miles.
My car has an automatic transmission.

– spark plugs