Sixity Auto 6 pc Champion Copper Plus Spark Plugs compatible with Jeep Grand Cherokee 4.0L L6 1999-2004

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These are the best plugs for jeep 4.0L motors! They love copper plugs and they last long in high altitude climates. I live 10k+ in elevation in my 4.0L does well with these champion copper plugs.You will have to gap them!And make sure you add zinc additive when you do an oil change.

They were cheaper than going to the store and they were delivered to my house. House made it easy.

These worked great, restored power and increased fuel mileage.

The spark plugs are working as expected BUT arrived in a flimsy plastic envelope which offered no protection to them. The ground straps were pounded against the electrodes on EVERY one of them. There was also no protective cardboard tube that goes over the threads and extends past the ground strap to protect them. Most of the ground straps were also pushed off center with the electrode. Luckily I was able to bend everything back into place and properly gap them. The spark plugs themselves are working normally. I hate to deduct a star because of poor packaging but because I had to repair them first, I did. Overall still a good value.