What SAE is 3 in 1 oil?
Besides, does 3 in 1 oil have detergent?
3-IN-ONE Multi-purpose Oil is a non-detergent oil and does not contain silicone.
Just so, what can I use instead of 3 in 1 oil?
Light machine oil is a good substitute for 3 in 1. You give the fingerboard a lemon oil treatment first - use pure lemon oil - leave it on for about a minute then thoroughly wipe off, then add a couple of drops of 3 in 1 or light machine oil (the type used on sewing machines etc.)
3-in-1 is just a light mineral oil and makes a decent light duty lubricant, or light duty corrosion protection. WD40 does a wide range of products based around lubrication and protection. 3-in-1 is just a light mineral oil and makes a decent light duty lubricant, or light duty corrosion protection.