The topic of oil has been beaten to death on gun forums.
The type of oil a shooter uses depends on the environment the gun is used in.
The amount of oil a shooter uses depends on the number of rounds the gun is going to shoot.
Each shooter has his/her own preference.
Some like Rem, Hoppe's, MilPro, Trans Fluid, Moble One, or any ol' engine oil.
I prefer to oil the trigger assembly with PB Blaster, and grease the slide with Tetra.
Some shooters have a special mix of stuff they swear by.
To each shooter it’s a matter of choice.
The most important fact is for the gun to be oiled.
If the gun is going to be fired a lot then any ol' oil will do...