tbird,
I agree most quick lubes will accept others coupons, but for over 35 years I have disposed of my oil properly.
I used to keep an old 55 gal drum in my yard in the early 60's and recycled it with a local oil company.
In the US Air Force, I had the base hobby body and repair shops, where many low or under paid service men and women learned how to maintain their vehicles. We never harmed the environment.
Today over 30 years later, Checker Auto
Parts will gladly take used motor oil.
Most Firefighters change their own oil. It is not uncommon nor does it harm the environment or void any warranty.
I do save money when I change my oil. I wash the undercarrage, check all hoses and other lubricants, rotate wheels and wash and wax the vehicles at every oil change.
My paint top and bottom always looks new, tires last 10-20 thousand miles longer, brakes , linkages,hinges etc. are always in top condition.
For me this is a hobby and a labor of love.
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'56 TBird '02 NM Bird
'98 F250 4X4 SCab
'68 AMC AMX
'73 Volvo 1800ES
'01 Olds Aurora 4.0