What oils to use

[cobham cobra]

The notchy or jerky action of the LSD can be due to the way it has been set to lock. When I trashed my diff last year Thunder Road had it rebuild by a specialist and I then took it to France for a classic event. On the trip the diff became increasingly "tight" making roundabouts and junctions particularly difficult. It got to the point when pulling out of a junction the diff would locked causing the car to hop round corners or spin the wheels. Once back in the UK TR whipped it out and back to the specialist – it turns out it was set more to race spec than street spec. Within 24 hours it was back in the car filled with what TR called "the most expensive oil in the world" (plus the recommended additive). The diff has been fine ever since.