I've decided to try some Royal Purple oil in my car. I'm switching from Mobil 1 full synthetic b/c I've heard good things of this oil. Just wondering...how long should I go on this oil change w/ RP? And I chose that STP filter b/c in that filter test I think Madspleen posted, that one had good results and used a metal encasing vs. Fram w/ their plastic ones.
![](http://i145.photobucket.com/albums/r218/kai21787/RockerArmOrings.jpg)
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