“changing your oil too often can cause premature catalytic converter failure,”
Huh!?! I never heard of this one, but I’m willing to learn something new. Can you tell me why this would be? Lower initial wear on the engine, which would increase blowby perhaps? Just guessing.
The damage is is caused by the phosphorus in the motor oil and other additives. Most of the phosphorus burns off in the first 500 miles after an oil change. The oil companies have been developing low SAPS oil to deal with these problems. With extended oil life, comprehensive oil change monitor vehicles, mostly European cars but soon all car manufactures will follow, I would and do trust the cars computer to tell me when an oil change is needed. For the last few years, most vehicles have no dipstick for the automatic transmission and service intervals of 100K miles. I believe in the next 5 years, motor oil will be lifetime oil to be serviced every 100K. Mercedes Benz already sells cars without motor oil dipsticks. Oil, lube, and catalytic converter technology changes real fast and is too boring and complicated for me. The rest of a car is fun and easy.