oil seal
 

Is it easy enough to change the front crankshaft oil seal on my xj8.

Probably a lot of dismantling before you can get access. The seal is located in the timing chain cover that can be removed and then one should be able to press-out the old seal and insert a new one, then replace the cover. While you're at it, I would inspect the timing chains and tensioners. It may be possible, of course, to winkle out the old seal then gently insert the new one without taking the cover off.

Is your car an X350 V8 (2003-2009) as this is the first post I've read about the front main oil seal.

Part Number : AJ8003698

Thanks for your help,the car,s a 2002 model.