Hey Guys, I was wondering what other people thought about using engine oil addtives as you reach the higher miles. I only have 50k on my car and don't plan to use anything. I stick to royal purple or motul. Anyway, I have a 98 Suburban with 154k on it and I have used slick 50 at 100k and 125k, but I also like Lucas. So my question is what do you think additives for your Subaru and other cars as well? Thanks for the input!