Kevin Lamson argued he was wrongfully discharged from Crater Lake Motors in Medford after he told his bosses he wanted no part of a sales campaign that he believed included deceptive ads and sales practices.

Lamson sued the dealership and won in trial court, but the Oregon Supreme Court reversed the decision. It said in a unanimous opinion Thursday that there was no evidence to support Lamson's claim he was fired for reporting the practices.

He had been at the dealership for 15 years when Crater Lake Motors contracted with another company, Real Performance Marketing, to hold a special weeklong sales event for used cars.

Lamson said he observed sales tactics he believed to be unethical and illegal, including "payment packing" by inflating monthly payments with life insurance and service contracts without the customer's knowledge.

When the dealership decided to hold a second sales event with the same company, Lamson complained to upper management in person and in two letters.