Not a problem. Started the X at 6,000mi and switched the car (98'monte carlo-60,000mi) to Mobil 1 5-30. The car is at 80,000 now without any problems(well,oil leaks anyways)
Mobil 1's web site has alot of good info,FAQ's etc. www.mobil1.com

note-be careful not to break the skid plate bolts wink
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in the morning i'll be sober, and you'll still be ugly.