Firestone: Standard Oil Change & Filter + 4-Tire Rotation (most vehicles) $16

The deal is extended until August 3rd, 2011.
Firestone Complete Auto Care offers a Standard Oil Change & Filter + 4-Tire Rotation (most vehicles) for $16 when you present this Printable Coupon. Offer valid through 8/03/11. [Store Locator]. 

If you match the coupon to a Mr. Tire center,  you can get an additional 5% off (helps with the tax!).

5% Competitor coupon link