Mobil DTE 24 is a hydraulic oil intended for use in pressure systems w/ pumps and valves - it has a relatively low viscosity of ISO 32.
By comparison, Mobil DTE Light is a circulation oil suitable for bath and splash environments, it is formulated to minimize air entrainment (foaming) and has a viscosity of ISO 32. Mobil DTE Heavy Medium has similar properties and a viscosity of ISO 68 - a weight frequently recommended for headstocks.
Mobil Vactra's properties do not include mention of anti-aeration characteristics. Its primary application is for way lubrication where tackiness is featured for extended adhesion to horizontal and vertical surfaces. Use of Vactra to lubricate high speed gear trains in enclosed bath/splash environments may have undesireable outcomes.
Mobil DTE Heavy Medium for the headstock, apron and misc oil lube points. Vactra 2 for horizontal ways.
(For spindle applications, Mobil has their Velocite product line.)
Last edited by EddyCurr; 02-16-2017 at 08:02 PM.
Cue up Vera Lynn and let the credits roll ...