My best ally ever is an independent small parts shop (three man operation, the delivery guy is a saint), twenty years of non chain and non web bliss.Now I just shop the local parts chains.
II used to have an independent just like that near me. Three guys who were there for a couple decades at least and always knew what you were talking about. Could get most common items (still went on-line for Saab particular stuff). I could walk there in a pinch. The owner (not a guy who was ever in the store) sold out to Car Quest. A year later, Advance opened a store in the next town over. A year after that Advance bought Car Quest... and then a few months later shut down the Car Quest store.My best ally ever is an independent small parts shop (three man operation, the delivery guy is a saint), twenty years of non chain and non web bliss.
Now I wonder if the Carnation Instant Breakfasts I get monthly from Amazon are real....
Higher temperatures, more air volume from the turbo, different engine tuning, different timing, spark advance etc, plus maintaining longevity, reliability and driveability are the reasons I would think as to why they state to use only those plugs.Makes me really wish the techline was still open so I could call and speak with an engineer to learn why they said to use ONLY the laser platinum BCPR7ES-11 and the PFH6R-10 for the Aero's and 04-05 arcs.
Personally I'd never use anything but those plugs. I tried the iridium's and the engine performance drop was very noticeable.
Not worth the risk of losing the DIC to me. A few years ago they weren't too bad but at $15 a plug its ridiculous.