Thanks Laurence!

Have you experienced (or heard of) a ‘singing’ noise in other XJ-S cars, and how the issue was resolved ?

My 2005 S-Type has a sealed-for-life diff, the oil level and quality is ok I’ve been told by my mechanic. However, its diff has a similar problem, which a Jaguar-approved service facility in Benidorm is now going to fix. The diff itself will be taken out and sent to Valencia to be repaired. They told me it’s a Ford unit, not strange since many components are Ford in these cars. The repair cost is about 1000 euros, a new one from the factory 4-5 times more.