I don't really know much about synthetics but I was thinking of going with that or some kind of high milage oil. I don't know what brand the people before me used but it was 10w-30. My car is a 99 LX automatic with 103,000 miles. The owner's manual recommends 5w-30 but it never gets that cold around here so 10w-30 is fine I just don't know about all my options. Thanks all.