over torque my spark plug....?
 

So yesterday I replaced my spark plugs in my car (e90 335i)

I borrowed a friend's torque wrench to do the job...
everything went well and car drives fine afterward..

But today when I was looking at the torque wrench...i realize I mis-read the readings on the shaft and it was set around 15N-m higher than I intended...FailFish.
The spark plugs calls for 23+/- 3 N-m. I thought I set it to 25N-m, but it ends up being more like 40N-m...

Is this..."kinda okay"? or going to be quite bad for the engine/spark plug?

The other thing is..beside using a toqrue wrench, I see some spark plugs manuf. and people suggests using finger tighten + 1/2 - 2/3 turn method.
I recall for pretty much all the spark plug, I only hand tighten it with a screwdriver and did about 1/4 turn before the wrench click. (If i had done 1/2 turn, the force would've been a lot higher...)

Also, when I took off 1 of the new spark plug installed with the 40N-m wrench. (wanted to check something) It came off much much easier than the old ones I took off. Tho the old ones were quite filthy and had some oils and carbon on the thread. I was actually worried the torque were too low.

Since everything seems fine now...should I even bother taking everything out and re-torque all the spark plug?

if it's not stripped you are ok.

If you're worried about it, how hard is it to crack them loose and torque them?

trust me, ive seen gorillas torque much higher than 15nm over spec. many guys don't even use torque wrenches

you are okay

harder than making a post on revscene for sure :lol

I guess I will just leave it.
This is probably the last spark plug change on the car anyway. (160K)
I thought if the over torque did damage the thread or something, but it is holding out fine now, taking it out could just make it worst.