the alligators won't complain

My father always said that his father pounded into his head that the best way to keep your car running forever was having your car's oil changed every 3 months/3k religiously. At an early age he showed me how to change the oil his old 1955 ford. He showed me in 1967.I remember you could fit small refrigerator in there because the engine compartment was so large.
I believe to this day if he would of had his his way he would have kept that old Ford until his last breath in 1977 if my mother didn't read him the riot act. Anyway, after he drained his oil from the car he promptly dumped t down the sewer saying 'the alligators won't tell'. He wasn't much on ecology.
My question: I have read in different posts that frequent oil changes contribute to pollution. I always thought that in today's more eco-friendly world that the service department somehow recycles all this, reuses it and this is now a more environmentally sensitive practice. Am I delusional thinking that oil changes are no longer a necessary practice at 3 K versus 5 K intervals. Isn't it better for the engine to have the oil changed at 3k intervals or am I just being environmentally naive?
Also, this is the first new car I ever drove over the first 1 K without changing the oil to remove, what my mechanic friend told me, removing the metal shavings in the oil following the break-in period. He said it improves performance an gas mileage and extend the life of the engine.

 

My grandfather bragged that he owned a Model T. I'm sure he didn't ever hear the word ecology let alone understand what it could mean in today's environment.
I would think it is difficult to judge him or his peers today.
We have bigger problems to address at this time like the ending's Bush legacy

 

I agree with you for the most part but Buh has an abysmal record on the environment in his home State of Texas when he was Governor, and the past eight years as President. His view on global warming should be a clue to how he has protected the corporations to continue pour contaminates in the air while he recklessly drove us in his Iraq war. BTW, the world dislikes us because our policies are arrogant and self-indulgent. I can tell you this first hand from my experiences in the military in Viet Nam in the 70's.
The global view of America immediately following 911 was supportive of our policy of strength determination and restraint even as we entered Afghanastan to find Bin Ladin. Bush squandered that good will away when he enter Iraq ...and all the attention to the economy, health care system environment, education...everything got pushed to the side. including care for the Veterans returning home with no limbs ..Please......Maybe we deserve Bush, and his greedy and torture loving cronies, Cheney and Rumsfeld or maybe he stole an election... think history will treat him kind?