Hi everyone, im about to change my oil,2001 honda civic,152,000, no leaks, no burning. 20 mile daily commute to work,%70 city driving. Previous owner did quaker state dino 520 every 5,000. I would like a better oil. Is it to many miles for synthetic? Is a high milage oil bad cause I have no leaks? Just confused as what to use? Thanks for any input you may have, you all are so helpful..Thank you.