bilbo6209

I'm looking at doing some maintenance to my new to me '03 S6 (she just clicked over 85K and I'm going to drop pretty much every fluid, filter etc and replace them. I wanted to do spark plugs too but want 100% sure what was the "best" plug to use. I'm sure it is an iridium but I wasn't sure about heat range, brand etc.

This is a daily driver, I do drive it a bit aggressive but it is not tracked etc. The car is stock.

uberwgn

I would stick with the OE plugs.

bilbo6209

So this would be the Bosch, if I'm reading correctly? the quad tipped ones?

it looks like ECS sells 2 types, but doesn't say why one is 2x the price of the other one... Anyone know what the difference is?

SloopJohnB@mac.com

AutohausAZ had a good price last time I bought them.
The plugs are supposed to be changed every 30K miles but they'll probably run to 60K without missing. Unless they do, in which case change them.
I let a set run to 42K, just changed them out.

Check your owner's manual for plug type.