Well most of us drive extra severely anyway, so to keep it in top condition I change mine every 2000 miles w/ the small filter. I only have 2760 miles on it right now, but I drive it hard alot and went down the 1/4mile 33 times already.
It depends on how you drive it, that is how you should regulate how often you change your oil and what size of filter you use.
I think these are the cross ref's.
HP-1010 K&N
L14610 Purolator Premium Plus
PH6607 FRAM Extraguard
TG6607 FRAM Toughguard
DG6607 FRAM Doubleguard
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