4seventy's right - no regulation worth while on that proof.

Oiling the brass certainly increases the strain on the breech - but it is not definitve - ie; cannot be controled to produce a repeatable result.
things that change the pressure against the breech: here's some things that change the breech thrust, off the top of my head.
1/. shape of ctg. ie: taper
2/. condition of ctg brass - ie: temper/smooth/rough
3/. viscocity of the oil
4/. amount of oil
5/. lubricity of oil
6/. powder charge and bullet weight of load

I frequently oil ctgs. when firforming. I use a thin oil, like WD40, which has lower lubricity in comparrison to other oils of the same viscocity, even. The incrase in bolt thrust cannot be felt in extraction, buy allows better case forming.

'lots' of oil - a non-compressible liquid - lots? Good grief - are they wishing to ring the chamber?