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