Actually, I haven't paid much attention to see if my oil is leak or not? I will do it from now on.
for the first oil change or oil change interval, it doesn't matter much for me between 3000 or 5000 miles as long as you feel comfortable with it. I will switch to synthetic Mobile 1 on my first oil change...and still keep it 5000 miles interval.
Back to the subject, will you replace the crankshalf pulley and oil seal eventhough you haven't found any edvidences that your 4Runner is leak?... 80% of me says yes, 20% will see. my 4Runner is 2000 miles now....maybe 2500 miles more to go. what is your opinion?