Instead of going in and asking for the 5K service, I'd suggest that you check your owner's guide and then tell the dealer exactly which services you want. Many dealers create bogus service lists that are far more expensive than the manufactuer recommends. Toyota has the recommended schedule on line at:
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I copied the following 5K Service recommendation for a 2005 Prius from the site:
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Replace engine oil and oil filter - Footnote 1 Rotate tires Visually inspect brake linings/drums and brake pads/discs
Additional Maintenance Items for Special Operating Conditions:
Driving While Towing Tighten nuts and bolts on chassis Driving in Desert or On Dirt Roads Inspect ball joints and dust covers Inspect drive shaft boots Inspect engine air filter Inspect steering linkage and boots Tighten nuts and bolts on chassis
Applicable Footnotes:
1) Reset the oil replacement reminder ("MAINT REQD") light after replacing engine oil, if vehicle is equipped with this light.
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So as long as you are just operating the vehicle normally in a reasonably mild climate on paved roads and not towing, the only thing you need, according to Toyota, is an oil change and a tire rotation. While the tires are being rotated, the mechanic should inspect the brakes, but any GOOD honest mechanic would do this with out being asked (or paid to do so). Of course if they see a problem, they will expect to be paid to correct it.
I'd expect to pay a dealer somewhere around $45 to $55 for this service unless I asked that the tires are balance while they are being rotated. With the balancing, the cost is likely to be around $85 - $100. (Taxes not included).
Ed