- Buick Ownership
- 16 regal turbo p2
I'm coming up on 50k on my stock 16 regal t and going to get spark plugs replaced. I was curious if anyone tried denso iridium tt and if so 4718 or 4719? I've found conflicting info and only difference seems to be the 19 is 1 heat range colder. Rock auto has been generally reliable in my history and they list the 4719 for 14 and 15 model but not 16. Im unaware of any significant changes bw those models. Any thoughts or insights appreciated!