Finally got brave enough to change the spark plugs. After pulling the first one, I realized I bought Autolite AP103's and not APP103's. 
On Rockauto's site I see Autolite XP103's, an Iridium version. The advertising hype indicates they are better in every way over platinum and double platinum. Cost difference is about $9 for 8 plugs.
Any benefit or negatives over the APP103's?
Current plugs have 126,000 miles (assuming they've never been changed) on them and the one I pulled so far doesn't look bad. The ground electrode shows a little erosion but the gap is still in spec.
I doubt I'll keep the Expy long enough to see another plug change. At my current usage another 100,000 miles will take 17 years.
On Rockauto's site I see Autolite XP103's, an Iridium version. The advertising hype indicates they are better in every way over platinum and double platinum. Cost difference is about $9 for 8 plugs.
Any benefit or negatives over the APP103's?
Current plugs have 126,000 miles (assuming they've never been changed) on them and the one I pulled so far doesn't look bad. The ground electrode shows a little erosion but the gap is still in spec.
I doubt I'll keep the Expy long enough to see another plug change. At my current usage another 100,000 miles will take 17 years.
