Originally Posted by MrHarris
What are the negative effects of running the car for another 7.5k miles (to the 15k mi mark) with that much iron/lead in it? Would it reduce the life of the engine?
I'm wonderin this as well. I went with the recommended interval for my second oil change - after the 1200 mile service, I did not change the oil until the car told me it was due at 15000 miles. Hope the potential long term damage is not too bad. I'm definitely doing an oil change every 7500 miles from now on.