The manual recommends "Shell Tellus 37," which is not available in the US. The Clausing Service Center recommended Mobil DTE24 light hydraulic oil, an ISO 32 viscosity grade hydraulic oil, as a replacement for Tellus 37 (I framed my question to them in terms of the Shell oil, not the Colchester lathe, which was probably a mistake).
But the specification called out in the manual for an oil to use if this oil is not available cites an oil with a viscosity (cStokes 40deg C) of 36.2. This happens to be the same number as their citation for Tellus 37; though the other numbers in the specification don't correspond. It could be a typo.
The lathe itself (again) contradicts the manual and carries a plate on the apron which specifies Tonna 33. If 33 were an ISO VG, then 36.2 would probably be within it (just, at the outside of the range).
Further conversation with friends has indicated that a heaver oil such as a VG 68 way oil would have the advantage that it would tend to stay on the ways longer during periods of inactivity. This is a big consideration for me, since the lathe is in a "condensing" environment in the garage and since as a hobbyist my use of it will be occasional rather than continual.
The manual says to grease the feed rack weekly, but does not specify the grease to use. I was hesitant about using just any grease in case there might be incompatibilities between the grease and the way oil (sure to drip down).
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