You will probably be safer if you pick a filter with a higher capacity for dirt, so something like an Amsoil, K&N, Wix or NAPA Gold would be the safest bet.
As far as your oil question goes, I'd probably go for the GTX HM 10w30 over their 10w40, as I know their 10w40 thins out to a high 30wt anyways, while the GTX HM starts out as a high 30wt and will most likely be more shear stable. Plus you get the bonus of the little bit of esters too.
[ April 24, 2003, 12:42 PM: Message edited by: Patman ]