I should mention, because someone else undoubtedly (rightly) will...

Being a naphthenic oil, 3 in 1 won't have a very high 'viscosity index'.

This means it will thicken at low temps and thin at high temps to a significant degree.

This is where the modern synthetic oils shine. They have very high VI and work ever so much better in cold weather.


"The price of good shotgunnery is constant practice" - Fred Kimble