MrPeabody
You are right that a pilot can perform some servicing functions but you are wrong when it comes to a physical check of engine oils on a QF aircraft. CASA may deem it OK for a pilot to physically check engine oils but the QEPM and QF 145 Exposition does not. A physical check of engine oils requires a certified tech log entry to record uplift, even if the uplift is nil. It is this tech log entry that will cause your CRS to be no longer valid. A similar example is removal of landing gear down lock pins. Considered by CASA as a servicing function and able to be carried out by a pilot but not by the QF system of maintenance. The QEPM specifies that an entry be made in the tech log that must be certified by a licenced engineer. A CRS can not be issued until that happens.
It is not as simple as reading the CASA regs when it comes to maintenance/servicing. The QF 145 Exposition and all docs it refers to demonstrate to CASA how QF complies with the intent of its regulations and in both the above cases OVERRIDES those regulations.