All of the major cam manufacturers sell assembly lube and they’re all about the same. Grey Other than cam and valve train all getting that lube on each contact point ( journals, lobes, lifters, push rod tips and rockers) he simply uses motor oil on the mains, rods, pistons and rings. He primes the system with a 1/2 inch drill motor and a dummy pump shaft for 2-3 minutes rotating the crank 90 degrees every 30 seconds or so.
Yeah, we used to do half STP and half SAE 30.I used STP back in the '60's. Nothing washes that stuff off.