4.0 AJ6 racer oil type

[CanoeSniffer]

Evening all, anyone got any finger in the air suggestions for what grade of oil to use in a 4.0 AJ6 in an XJ40 race car? Usage being three or four hard runs of a weekend, lay up periods in between and little in the way of mechanical sympathy!

Cheers

[CanoeSniffer]

XJR500bhp said:

You race within the JEC series?

Planning to, I've bought Gail Hill's old car