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i run (motorcraft) synthetic in my DD, but cheap dino-oil in my old truck. a few extra bucks every several thousand miles isn't that bad. but i really don't feel that it makes much difference, i just feel better about it.
01 ford explorer sport, 105,000 miles, synthetic oil/filter changed every 5000. no engine problems other than pcv valve and egr valve (and regular maintenance items, of course).
but, my parents had.....
94 explorer, 298,000 miles, oil changed every 5000, but used cheap walmart 10w30. finally cracked a head (or maybe head gasket), but no other real problems. sold it to a guy that had it running again in 2 days.
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