Yes, Amazon is great. I found out about them by chance (a person whose vehicle I was working on actually found them).

Yes, Amazon is great. I found out about them by chance (a person whose vehicle I was working on actually found them).

fishersfort wrote:I've heard these platinum plugs don't give you the warning (rough running) older plugs give when they're about to go. Therefore we're supposed to replace them at 100,000 miles, even though they appear to working great.

Anyone else hear this same story? Can't recall where I heard it.

Not true. Another "wives tale". Back in the early days of platinum plugs, you would have the platinum pads falling off at lower mileage, usually because of folks running engines on the rev limiter (common with rental cars or company cars). The increased demand voltage needed to jump the now wider gap would give you a random missfire, usually at about 40 MPH. Nowdays it's usually contamination that gets on the higher mileage plug OR the increased demand voltage would cause the boot to spark plug insulator interface to break down and result in the spark to go down the outside of the insulator.