This was true in the past but not now!
Not sure about a 98 car, but in the last 4 or 5 years things have improved hugely.
Infact now they're better built and more reliable than a lot of German cars including Mercs and BMW's, this is also backed up by customer surveys.
Are you aware of the Nikasil lining of the bores issue,the sulphur in some low quality fuel breaks up the Nikasil lining in the cylinders, causing a loss of compression. Once the lining is damaged, excessive bore wear of the soft, underlying alloy occurs very quickly.
This was common amongst BMW's and Jags in the late ninetys, the Nikasil coating process was developed by the German firm Mahle. The problem wasn't apparent during testing as they only used good quality fuel.
Therfore some cars would be okay,best to get it checked out.
http://www.dandmbr.co.uk/jaguar/x308tips.htm