I’ve found that Motorcraft platinum spark plugs work best in my 1998 Ford Ranger. I tried Bosch plugs and it ran terribly. Nothing but Motorcraft from now on (for Fords).
I however replaced mine with motorcraft and do not have pinging anymore but still run 91 octane as 93 isn’t common in socal.
We changed that spark plug and the customer was happy with the magneto drop. That spark plug worked fine on a Champion spark plug bomb test.
Champions quiet redesign of their plugs to match Tempest made up my mind. It matters, and Champion is just trying to save face.
I always run champion platinum in the coil rail 4.0s. Sometimes engines are particular.
On any of the gas trucks with the "modular" engine family (4.2 V-6 and 4.6/5.4 V-8) it seems like if you use anything other than Motorcraft spark plugs and coil packs, the engine won't run right at all, no matter the brand.
I once had to use 99 cent Champion plugs in my car for a few months when I was flat broke. They worked fine but didn't last long.
Avoid Champions. Use NGK or Denso. Don't go cheap on plugs because the job is labour intensive.
Side note, Champion spark plugs suck. Use them in lawn mowers.
Champion is shit for cars. Leave it for mowers and weed eaters.
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