Anyone know average life of TR6 plugs

[jguerrero]

Ive had mine in for about 3 to 4000 miles now, and wondering if anyone has any ideas when a good time is to switch them out.

I am running at 500/500 and wondering if it is my best interest to change them frequently.

any feedback

 

[VintagePorscheG]

Have been changing them after 15k, they are cooked by then.

I have just put in my 3rd set after stock.

 

[imsuperman]

i still have the stock plugs in after 32,000 miles. Should I change them soon? The dyno didn't show any spark blowout.

 

[sambandit]

There are not very expensive. Just for some cheap insurance, I change mine out every Spring. Only about 4000 miles.