Level 3 is where lubrication engineering happens, and this book does the engineering: filter efficiency from the beta ratio, an offline loop sized for cleanliness rather than for the circuit, regrease quantity from bearing geometry, and a cleanliness target derived from the machine rather than borrowed from a table.
Varnish gets its own chapter, because it is the modern turbine oil problem that every routine test can miss.
Study material written by Sensemore. It is not accredited training, it is not from any certification body’s question bank, and it confers no certification.