> This was because people were going 10-12,000 miles between changes and
>> sludging their engines.
>
> So why did changing the recommendation alter the behavior of people? If
> you are going to ignore a 7500/5000 recommendation, aren't you just as
> likely to ignore a 5k recommendation? I suppose the maintenance required
> light might help, but I know more than a few people who are comfortable
> ignoring those as well.
So that people who did heed the recommendation would tighten up a little bit, and those who didn't were SOL...?