Probally the Best Plug you can get is a NGK Laser-Iridium The Number for the Spark Plug is #5599 in the NGK Brand.
GM OEM platinum plugs is the best you can put in your Regal.There rated for 100,000 miles, you can go with the after market plug like NGK and Bosch also and remember they are pre gaped so don't be trying to gap them. The electrodes are harder and more brittle and can break off in the engine if weakened due to the heat.
Good luck and thank you for using fixya
Check here for:
- Buick Regal LS
- Buick Regal GS
Hope helps (remember rated this).
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