Re: smokey 4.6l
How long have you noticed the blue smoke for? I imagine at least a month as you mentioned you took some long trips. Now that I think about your problem more, it may be a plenum problem and/or a bad EGR valve. If you haven't replaced the PCV valve in a while it'd be good practice to do so.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!