You can't be that old. I'm only 45 and they were still teaching about it when I went through A&P school.
Here is an excerpt from a 1959 Cessna Owner's Handbook:
Oil Dilution System
(Optional Equipment)
To permit easier starting in extremely low temperatures, an optional oil dilution system is available. Used immediately before the engine is shut-down, this system injects fuel into the engine oil and reduces its viscosity. When the engine is again operated, the fuel evaporates and is discharged through the breather so the oil resumes its normal viscosity.
The oil dilution system consists of a solenoid valve on the engine firewall connected to the fuel strainer outlet, and to a tapped plug in the end of the low pressure oil screen on the engine. The valve is opened by pressing a push-button switch on the instrument panel.
Detailed operating procedures for the oil dilution system are contained in section III.
Also, check out this link:
Aircraft induction, fuel and oil systems., Page: 14 | UNT Digital Library
That page gives some details of operation, and the next page shows the injection valve assy.
edit: I have no direct exposure to the systems, so cannot answer your question about procedures.