I have a 2008 Toyota corolla with 153000 miles. The motor cap says it uses oil SAE 5W-30, but when i when to buy it, the guy selling the oil warned me that with that many miles i can't keep using the original recommended oil, so he sold me a SAE 10W-30. It was the original oil from Toyota, but i was wondering if what he said is true. In case this is true, after how many miles do i need to change the oil type and whats the criteria for changing it? Also, is it worth to buy the original oil from Toyota, or do you recommend any other oil?