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thinking of replacing the plugs. what brands are popular? thx

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I just replaced mine with Champion Copper Plus...so far, I'm happy with the results.

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NGK.  I got them, but haven't put them in yet (waiting for MSD Wires).  Champion Coppers will melt if you live in a place like CA where gasoline by law has oxygenates in it. :cheers:  Gotta get Iridium tipped plugs.

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Your 5.3 may already have NGK.  I had no idea. I contacted NGK about what plug they made was best for my truck--" Got a call from NGK today.  The 5.3L comes with either an NGK or a Denso. Pulling a plug will tell.  The NGK is a  PZTRSA15 with a 0.060 gap. the Denso is a PTJ4R15 (I think, or a PTJ14R15). "

 

The plugs have been tested to 150,000 miles and he said they should be fine to 100,000.  I asked him when he would change them in his truck. He said, pull them and check, but 100,000 is definitely not too long.

 

 

NGK post info

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