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We are the largest privately held gas compression company in the US. We have around 1500 natural gas compressors that we rent and perform full service maintenance on (around 2 million horse power total). Our cheapest plug is a little under a buck each and the ones for our large engines cost about 100.00 each (actually our cost is somewhat less $86 or so). They go in the 3500, 3600 series cats, 5000-8400 hp Wartsillas, AT27 Waukeshas (4800hp). The computerized ignition system checks firing voltage and lets you know when plugs need to be serviced, cleaned, and re-gapped. Most plugs are changed on a monthly basis, except for the real expensive ones, they last 3 months to 1-1/2 years depending on the fuel gas, load, and engine. We have used Champions for about 11 years now without too many problems but Champion has had a few problems in the last couple of years. I'm sure their precious metal industrial plugs aren't an even match to the automotive plugs comparison wise. We have used a limited supply of AC, Stit, Altronic, and a few others but stay with Champion. I run NGK in my ATV's, and nothing but Harley plugs in my Harley (probably NGK as well). I run AC plugs in my Chevy's and Autolites in my ford.
Champions I use at work, and sometimes when I stock one that fits my lawnmower or welding machine I'll use it. Mostly, it's preference, but there is a difference when it comes to high horsepower lean burn engines, they "have" to have a flawless ignition system.
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