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Thanks all for the replies.

Yeah, this would be my fourth trip. On my first trip, two and a half years ago, I used Mobil 1 15W-50 in my '93 Grand Marquis. It had 141,000 miles on it and usually burned a quart of 10W-30 every 1,000 miles. But with the 15W-50 I didn't lose a drop for over 6,000 miles. And I was doing 80mph...

2001 Ford Crown Victoria, 4.6L V-8 with 10,000 miles. I usually use M1 5W-30, but I may be driving cross country this summer and I'm wondering if I should use a heavier oil.