One problem related to strut failure has been reported for the 2004 Jaguar XJ8. The most recently reported issues are listed below.
On 01/04/10, car showed "vehicle too low" warning. I called the dealership and was told to let the car warm up which I did and warning disappeared. Warning appeared each day & I let car warm up each day to correct. On 01/08/10, additional warning "air suspension faulty" appeared and vehicle's front end was very low too the ground. I called dealership and was told to immediately stop driving and have car towed in b/c the struts had failed and could cause the tires to blow. Had car towed to dealership and was told that the extremes in temp in atlanta had resulted in a number of cars being brought in for same problem -- air bag compressors collapsed b/c of car sitting outside during the day. When I asked if this was a manufacturing defect (since numerous 04 jag Xj8s), I was told "don't know". When I tried to get additional information such as temperature spec ratings for the struts, the dealership clammed up. When I picked the car up, I commented on the 14 cars in the pick up area which was unusual, I was told the damage to all the cars struts was "normal wear & tear". No one would even entertain my questions a manufacturing defect or the manufacturer bilstein. Had the collapse happen while driving on I-285, it could have been disastrous. This issue needs to be investigated to prevent future collapses of struts by replacing those struts which do not satisfy temperature spec ratings.