"I'm surprised that businesses allow the public to dispose of their used oil."
Depends on the store/business? some alow you to dump it, some supervise (watch and look what's in the Bottle), some will take if from you and they dump it. Some have logs....
I agree Simple oil change can be BIG problems and even the dealers can't garrantee quality.... That's why you have to follow up especially the ones that offer free oil changes for the first so-so....or the blue light specials for to good price to be true. I have caught some NOT changing the oil for lady co-worker....Some overfilling (actually alot over fill cause they use the nozzle and pump it from 55 gal barrel) too lazy to check their work.
That's why I always follow-up before I start the car or leave the lot.. The service manager's are some times dumb founded when I Shut the car off and pop the hood and say let's see how you done. My honda dealership actually does excellent work, haven't found one mistake yet after servicing but, time will tell, they are 2-0 so far.... GM and Fords that I have owned under warranty don't far nearly as good....That's why after 45 years they lost my business.
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