I would doit around 50k i truly beliebe if your vehicle has 16.000 miles its too soon you can also take plug off and make sure its not a cheap plug dealers usually put cheapest cables and wires.if they are cheap plugs i would definately cgaange them for some a little more expensive.
Well me personally I have always changed my spark plugs on all my vehicles either every year or every 2 years depends on budget and brands I'm using always spend a little more and it will pay off in the long run with mileage
Now a days, most new vehicles recommend the first tune-up at around 100,000 miles, I hope this helps!
SOURCE: how to change spark plugs on 2 lt 4 cylinder chevy
Remove spark pug wires from spark plugs. On this engine, it is located on the top. Remove all plugs with socket and ratchet. The socket size is a 13/16th. The new plugs should be pregapped if the correct ones where given to you. But check the factory spec for the gap. There is a sticker in the engine compartment that should tell you the gap. Gap the plugs as required and install them. DO NOT OVERTIGHTEN PLUGS, Double check factory tightening specs for plugs. Use a torque wrench to tighten plugs to required torque. If this this information is not available to you, then snug will be fine.
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