You have to be vigilant. Years ago, I received a promotion for 30,000-mile
scheduled maintenance on my 92 XLT from my Ford dealer. It had so much stuff
that was left out (or inappropriately added), I decided to investigate this
for the newspaper I was working for. I checked similar promotions for my
colleagues' cars of different makes and models. I found the same thing again
and again. In some cases it was because the hire marketing firms to hawk
generic service plans.
You can see the story here, if you like:
http://giorgianni.homestead.com/Clips.html ("Car maintenance fraud").
Here's a newer version I did last year for another publication.
http://tinyurl.com/c5c9c
Note a dealer's effort to change the timing belt on a customer's Pathfinder
at :60,000 miles instead of the recommended 105,000 miles. Just as you said,
after the customer refused, the dealer gave her a receipt with a warning
that failure to follow recommended service procedures can invalidate the
warranty!!!!
For my 92, I decided to get all the Rotunda tools and the Haynes and Ford
shop manuals and do every bit of maintenance myself, including repacking the
wheel bearings, greasing the driveshaft slip yokes (all three!) and all the
other stuff. And I'm no auto repair expert. I saved money, and I know it was
done right. And beyond that, it gave me a great feeling of
accomplishment!!!!!! I've done it twice now, for 30,000 and 60,000 and all
the lesser service in between.

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Regards,
Anthony Giorgianni
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> It is very frustrating that dealers want to do maintenance that isn't
> listed in the Ford maintenance schedule and then they don't do some
> things that are listed. Then if you need a warranty repair they say the
> warranty is void because you didn't do something on the maintenance
> schedule! What to do, argue with them?