My 2011 Toyota has 15,000 miles on it. I just got its oil changed, and the new place that I took it to told me that I NEED synthetic oil 0W-20 (so they put in "Castrol Edge 0W-20"). But they also told me that I only need to get the oil changed every 10,000 miles. The built-in oil reminder in the car reminds you to get new oil every 5,000 miles though.
So who is right: my car, or the mechanic? Is it safe to replace the oil after 10,000 miles? Thanks in advance for your advice!