Differential fluid

[paulXK8]

Hi
I'm going to change the differential fluid in my 2005 XK8. I'm having some issues deciding what fluid to use. Manual says Spirax Super TS 90 but this is obsolete. The replacement seems to be Spirax Thermally Stable Super 90 but this is only available in large amounts. There must be an equivalent product (e.g. by Castrol) but I'm finding it difficult to isolate one. Any ideas gratefully received.

[poprivet]

Opie oils are very good www.opieoils.co.uk Search by reg number or manufacturers spec.

The only reason that Spirax was specified was a commercial tie with Shell and Jaguar.

[paulXK8]

Great - thanks. Not a stock item at Opie but they can supply.