As you probably know, engines don't slip, clutches and automatic transmissions slip.
If it is a manual shift car, then either the clutch pads are shot or the tension on the plates is too low or both. This problem is agrevated by people who ride the clutch (leave their foot on the clutch when they are not using it),
If it is an automatic, the first thing to check is the transmission fluid level. If that is OK, the it may be bad news. Loss of fluid is normally do to a leak. Most people see the wet spot on the ground where it is leaking before they notice slippage.
I am not sure, but I think that all XCs are automatics.
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