I recall being told not to do this on a brand new rebuild. The reason being that a very good quality oil will prevent the tapered edges of the new rings wearing flat in the way they're designed to.
Paddy
Land Rovers - designed by idiots, built by morons, driven by people who ought to know better.
Every time I set out to repair anything on mine I end up having to fix at least 1 other thing because of bad design/rubbish materials/cheap parts (delete as appropriate).
Paddy