Spark plugs
#1
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Hi, 2003 1500 4wd 5.9 gas Laramie. In the manual, for spark plugs it says R12LC4. When I looked that up I find Champion Copper. Is that the one to go with. I get conflicting answers. People have told me only go with Bosch, only NGK. Then I also see all these different spark plugs, iridium etc. what is the correct spark plug to go with (brand and material eg copper vs iridium)? Thanks for the help.
#2
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Mechchallenged (07-09-2024)