Which oil to use?
 

so the '01 ES(4 cylinder) now has ~135,000 miles. i've been using fully synthetic 10w-30(for the last 2 oil changes), is this the right kind of oil to start using? the oil light does flicker sometimes while idling, but i've checked the oil level and it's fine. it can also be the oil level sensor, which i know is faulty on these cars. thanks!