hey guys, i bought the civic used with 165k, and i did a clean and rinse with auto rx. been running dino oil for the last couple of months or so, do you guys think i could go with a synthetic oil now, or should i just stick with the dino oil. my wife and i prob will put 40k a yr on this car, alot of hiway miles. i have read that going to a synthetic in an old car might cause it to start leaking oil and i dont need that at all. no leaks now, and it doesnt use oil, what do you all think, thanks alot