How often should I change the oil? on 2002 Lexus ES300

I have been changing the oil every 3000 miles. People tell me this is not necessary for my 2002 Lexus ES300. I drive about 600 miles a month. I don't know whether my mechanic outs in synthetic or regular oil. The oil change costs about $40.

Asked by for the 2002 Lexus ES300
Read owners manual!!
1 more answer , 1 more comment
3 to 5k miles is good i don't rec 7500 to 10k like they rec. nothin is better than clean oil 4 your car
THAT IS SO TRUE!!! I've seen people goe 15k between oil changes 'because they use synthetic' not realizing it's still picking up and holding all the dirt and combustion by-products(simply put) that any kind of oil will hold and just keep on flushing it through the engine.Nothing beats clean oil and a good filter and I doubt any of us have seen an engine fail due to 'to many' oil changes.