Jim Keenan,
Was it Parker shotguns that recommended 3-in-1 oil in the owner's manual ?
Coming up with tin cans that actually put one drop where one wanted...
Not only did folks use 3-in-1 they also used Winchester Gun Oil in a red can with yellow on the label .
Winchester looks and feels similar to 3-in-1 , just it does not have the citronella smell.
Esso, Texaco, and Gulf also sold a machine oil, in a tin can, and it would remind one of 3-in-1 .
Radiator Specialty makes Gunk Super Oil. It is clear, and some folks preferred it, so as to not stain clothes, and it has no scent.
I still have tin cans of Hoppe's Lubricating oil, the can they say is worth $45 to collectors.
I still have a tin can of Winchester Gun Oil, and have been offered $50 for than tin can.
I have a tin can of Suoer Oil and a itty bitty can of 3-in-1 oil back when Boyle-Midway was the parent company.
Just me perhaps, the old 3-in-1 in a tin can by Boyle-Midway is different from the oil in the plastic container WD-40 puts out being the parent company now.
Mentors and I cleaned many a gun with gasoline and lubed with machine oil.
Oh we had Gun oils like LSA, Browning, Hoppe's , Winchester, ...just the Texaco can or Esso can was handy.
When I used to buy a brand new Remington, like a 1100 for $149, there was no Rem-Oil, owners manual said to use a good oil for guns or machines.
Remington Rep said he used 3-in-1, and his buddy used Super Oil on their 1100s.