Bought the TVR last year,Ran it then iv spent all winter Going through it all and Doing the Chassis!! I'm just finishing it off this week end next...All ready to Tax on the 1st April Service,clean,Gearbox/Diff oils etc
Our elderly lumps need slippy stuff in them so the zddp levels become more important,checkout your oils against Mobil racings 15-50 1200ppm zinc level.
I think any good quality oil is good.. but not found the 5W and 0W work as well .. they are so thing that tickover seems to be very low and oil pressure definately suffers at tick over.