There are many places to find free oil change coupons.
Mechanic Shops
Many auto repair shops offer free oil change coupons when you have work done on your vehicle. The use of these coupons is usually limited to the particular shop you employ to do the repair work, so keep this in mind when weighing your options.
Motor Oil Companies
Another avenue you could use is the motor oil companies. Check with the various company web sites to determine what coupons they offer. Many motor oil companies have partnerships with oil and lube businesses. The free oil change coupons are a way to get you into these shops and in exchange use their brand of oil.
Coupon Sites
There are coupon sites that offer various coupons and discounts for services and products. Most coupons are printable and free. Some retail stores or manufacturers don't always offer printable coupons, so the sites offer mail-in coupons instead. Check the fine print to ensure the coupon is redeemable at point of service.
Don't forget to check your mail. Motor oil companies and garages on occasion send you coupons for a free oil change if you meet certain criteria.