[mattoak]

I've been looking this up and have read both arguements.....some say if it ain't broke don't fix it. Others say change them out before one goes. Let me know your opinion or experience in the past.

I had an ignition coil go bad on me at around 80k miles in 2012, now I'm at 155k miles and haven't had any more give up. I changed spark plugs at 90k miles.

So should I bother replacing the ignition coils, or just wait until another one gives up? I'm thinking of grabbing one to keep as a backup but Not sure if I should go ahead and do all of them. If I do them all, I'll also change spark plugs. But if I don't do them I'll probably also wait until the current plugs have 80k miles or so to change them out.

Also, what's your opinion on spark plug interval? I know BMW says 100k.