Q: Hello all. At what mileage should I replace spark plugs, and timing belt on my H on 2008 Honda Ridgeline

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onda Ridgeline? Thanks
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7 years or 105,000 miles, whichever comes first. Use HONDA (NGK) plugs.Unless your having problems , it's a waste any sooner.
you may just need to re-gap spark plugs. e3 is my preference for replacement but any premium grade plug will be sufficient. re-gappng plugs is also a good oppertunity to examine coils. if you wait to long to replace or re-gap, you run the risk of plug seizing to the point of breakage. this is why 50,000 miles. use never seize on plug thread on re-install.