Originally Posted by CharleyGFX

This might be somewhere on the forum, but I can't seem to find it. But anyways. I've had my Z for about a year now, bought it last April. And ever since than, I've ALWAYS change my oil every 7-8K thousand miles with Royal Purple, with a KN oil filter. But I had a discussion with one of my friends today, and they swear up and down that in the long term, Royal Purple will ultimately mess up your internals. My two friends are driving a Civic Si(K20) and a TSX(K20).

So the question is? is this true. If so? do you guys recommend switching to Mobile 1. With A Mobile Filter