Well I have a 92 coupe lx honda accord. It takes like 3.17 quarts of 5W-30 oil. It's run on regular oil it's whole life. It has 175,000 miles on it. I just bought 4 quarts of royal purple full synthetic 5W-30 and some honda oil filters, would this be a bad idea to put into the car? If so.. what should I use, and if it is a bad idea, what are the side effects?