Originally Posted By: 01_celica_gt
seriously? is this engine related? design flaw?
I have never had any spark plugs having issues coming out and this is with them having 160k+ on 4 of them with iridium plugs...
my experience is only with honda and toyota though, so can't speak of any other manufacturer.
have owned a 96 civic that even had copper plugs, they always came out easily...
never applied any anti-seize either, it says on the ngk/denso plugs that there is no need to apply any lubricant (I think I read it on the box, not 100% sure)
There are a few real PITA engines for this! Old Dagenham built Ford iron head engines were notorious, when you bought one used you better make sure the plugs come out or there is a good chance your going to be pulling the head.
No manufacturer is going to advocate anti seize unless there is a problem eg Ford modular TSB.
There are multiple issues with it at the consumer use level.
* There are multiple types of anti seize compounds, you should use the correct type for the cylinder head material.
* Torque values are affected by anti seize, the amount of torque reduction must be taken into account.
* Too much of it and it gets on the electrodes will short the plugs causing a misfire and possible cat damage (manufacturers must warranty the cat for a long time).
Given these issues it presents a liability they just as soon not deal with.
The coatings on plugs do work but its not 100%, stuck plugs can still happen. Anti seize is fine and does prevent the issue but it needs to be applied properly.
A very thin film on the threads only and reduce the torque by 25% and you will never have a problem with it or stuck plugs.
If someone just lathers up the plug with the cap brush and strong arm tightens the plug in then there sure can be problems.
I have been using it for 42 years professionally and never had an issue of any kind with it in any engine.