The Atlas manuals including the MOLO gave SAE 10 up until sometime in the 1950's when they changed the recommendation to SAE 20 retroactive. The only exception is that on the open gears, a no longer available grease was recommended. My assumption on an alternative grease is that it should also be graphite bearing and that it should be rated for high temperature. The reason for the latter recommendation is that most common greases not rated as high temperature will liquefy and sling off at only slightly above 100 F.
SAE 20 includes ISO 46 and ISO 68. When unable to find oil rated as SAE 20 ND, I use the latter but at least one person reported using the former. Detergents, AFAIK, are never mentioned in Atlas documentation and the assumption has generally been to use Non-Detergent. There are two reasons for this. First is that commonly available high detergent engine oil is generally more expensive than straight 20 weight and there are no known benefits to using it on any machine tool we are apt to have. The second is that most commonly available motor oils like you would find in an auto parts store have an additive that absorbs moisture. IC engines get hot enough when running to flush the absorbed moisture out the tail pipe. Machine tools do not. The remaining additives (detergents) probably do no harm but serve no useful purpose in a machine tool so aren't worth paying extra for.
Mobile sells an ISO 68 oil described as "Heavy Medium Circulating Oil" which is what I generally use when I can't find straight SAE 20.
The most commonly available 3-IN-ONE oil is SAE 10. As shown by the photo above, it can be had in SAE 20. But some simple calculations will show that it is pretty expensive per gallon.
Way oil and chain-saw bar oil clings to a vertical surface better than most other oil so should probable be used on the ways and dove-tails.
