The service manager is full of dung... these are legit bulbs, manufactured by Osram Sylvania, the same folks who make the majority of bulbs that can be found on all cars using 9006/9005 type bulbs.
And if they give you grief over warranty regarding aftermarket parts, you may want to remind them of the Magnusson Moss Warranty Act, Title 15 US Code Chapter 50 Section 2302 (no, I'm not an attorney, I looked it up!)
<I>
Q. Does installing an aftermarket part, automatically void my vehicle factory warranty? A. NO, According to the Magnusson-Moss Act of 1975 (see below):
The Magnusson-Moss Warranty - Federal Trade Commission Improvement Act of 1975 protects consumers from such fradulent activity by new car dealers. Under this Act, aftermarket equipment that improves performance does not void a vehicle manufacturer's orginial warranty, unless the warranty clearly states the addition of aftermarket equipment automatically voids your vehicle's warrany or if it can be proven that the aftermarket device is the direct cause of the failure. The easiest way to check this is to look in your owner's manual under, "what is not covered". <B>Under Magnusson-Moss Act a dealer must prove, not just vocalize, that aftermarket equipment caused the need for repairs before they can deny warranty coverage. If they cannot prove such claim-or offer an explanation- it is your legal right to demand compliance with the warranty. </B>The Federal Trade Commission (202.326.3128) administers the Magnusson-Moss Act and monitors compliance with warranty law.
</I>
From Sylvania's site at:
http://www.sylvania.com/auto/sstar_faq.htm
<i>
What is the life expectancy of SilverStar?
The life expectancy of a SilverStar halogen light source is dependent on the driver