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I suspect that most oilstones are detergent-resistant, since they're as likely to get used with 10W30 or WD40 as they are with proper honing oil.

I've also used Kroil on a Thuringen to good effect.

Kroil is a penetrating lubricant like WD40; however Kroil comes in liquid form so it's somewhat less messy to apply to the hone.

With the waterstones, you're always exposing fresh abrasive as you hone. But with an arkansas stone the abrasives on the surface wear down over time, so at the microscopic level the surface winds up...