N_Jay

Time to change the plugs, or maybe late as I don't have full records.

Hot, warm or cold?
At 90k miles, how much risk is there really that one is stuck?

redlightrich

Cold please.. Aluminum expands when warm or hot.. Don't fret too much about a stuck plug.. Just be careful.

Good luck

Rich

paggnr

I changed my plugs today at 105000km. Could not believe how stuck they were. I was worried I was going to snap one off whilst removing. Take your time

N_Jay

Did the plugs today. Two (Left rear and center) were as tight as I have ever seen without the threads being damaged. Once I got them one or two fill terns, I sprayed some penetrating oil, snugged them back and the proceeded to pull the rest of the way. The other 4 were not as tight, but one felt just a little funny, like galling threads so sprayed that one also. Wiped the oil away before putting in the new plugs. New plugs went in smooth. Engine now seems to idle a little smoother. Will do the plugs in 40k or do next time. I don't know how long these were in. (At 90k miles. 2012 car.) Anyone know if there is really any difference between the green Bosch "super" plugs and the blue plugs?

GNB

Please confirm plug socket size for 911 991.1 - is it 5/8 " ?

harveyf

You do know you are on a Cayman forum?