68 grade turbine Oil will work just fine in the headstock of your lathe for years to come.
Your lathe will probably not work hard for living ever again, well maybe not, but for those of us that are weekend or week night warriers should be fine.
Don't put gear lube in the headstock!!!! Stick with the R & O 68!!! Gear lube will mess up any sleeve bearings you may have in the headstock. Plus, you are not maxing out the HP rating of the gears in the headstock that require gear lube! Never will come close!!! Headstock does not need any sulphur base lubricants.
My Lodge & Shipley manual on my Model X lathe says to use "Highly refined mineral oil entirely free from acids and alkali and possessing high oxidation stability and film strength." continues to say "Vicosity of 150-275 sec. saybolt at 100 deg. F". This is for the headstock.
SAE 68 Turbine oil or R & O 68 oil pretty much fits the requirements L & S specifies!
I've run the same oil in the headstock of my Sheldon Sebastin lathe for over 30 years. Still clean the day I put it in, after a complete headstock rebuild back then.
So the old adage engage mind before operating jaw applies to posts as well.
It looks like most lathe headstocks take a medium grade non-detergent oil. Mine calls for Mobil DTE heavy medium, which is an ISO 68 oil. I had always heard it called spindle oil so the turbine oil thing threw me.
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