Originally Posted By: Oil Changer
You will be fine with the 10W-40. If you're itchin' to change the oil before the trip, your choices are almost limitless. SAE 30 or 40, an HDEO 10W-30 like Rotella T5 or Delo. 5 or 15W40 HDEO, an HM 10W30 or 40...like I said, endless. Skip the Lucas. That's what I think.
If you are worried I would suggest the HDEO 15-40. Delo 400LE is less than 12 bucks a gallon at Walmart's around here and it is a very robust oil, as are the other HDEO oils.