With gas at over $2/gal. I am driving my wife's Cavalier to my job as much as possible. The result is that I'm not putting many miles on my 4x4 Ranger. I know 4K miles is no problem for Havoline 5w30 conventional or Motorcraft 5w20 blend. If it takes me 6 months to get to that figure in the Ranger, does 6 months time seem ok for these oils? My gut tells me yes. I drive mostly highway for 25 minutes one-way. Comments?