Re: another oil question/filter
With Royal Purple you should be able to go much farther than 4k, the trick is finding out based on where/how you drive how long it can go. You can have the oil tested to find this out easily enough and its cheap. That might be what you need to do then you can correctly let it go 10k if it can.
I change mine once a year and use Mobile 1. You may also wish to consider Amsoil oil as its probably the BEST on the market. I use OEM ford filter which is VERY good. The issue is the oil filter can only filter so much, you may can just change the filter and not the oil as well.
I think 4-6k then change it, keep some oil to have tested. They can tell you that you has more life left in the oil or not.
2003 Cobra Vert (Redfire) #3938 of 5082 @ 05/27/2003
472rwhp/493rwtq -Modification List
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2012 Mustang 3.7L M6 (Kona Blue)
2011 Ford Edge Sport (Red Metallic)