Outer Limits 4x4 Board

just wondering about a problem my paj seems to have.

i have to change the glow plugs every year on my 4m40td is this normal???
the car has done it from around 4 years ago. they are the correct size. just seems way too often seein as the hilux is once every 2 years.
so anyway anybody with a diesel could you please tell me how often you have to change yours...
thanks andrew

I think Vineboy recently posted a similar problem with his Triton? Have a search - I think he worked out the control relay was applying full voltage for too long?

Edit: here

thanks scott
the search function is a great thing.
i'll just have to try harder next time