Which glow plug should I use a A8 or A3?? Which is better? I assume the A8 is a better plug since its a bit more expensive.
What is the difference between the two? Is one just a hotter plug than the other? Does one last longer than the other??
Any other suggestions of a different glow plug that may work better than the ones mentioned above?

Im not having a problem or anything but i feel knowledge is power. Power over the LHS who wants to sell you the most expensive stuff they got and you may not need it!!!

Thanks,

Sean