Never heard of it, but,
with an internet search it seems that this compound (brand name Lubrol PX) is Polyoxyethylene 9 lauryl ether, is this true?
If it is, then i found it as Sigma P9641 (or "Nonaethylene glycol monododecyl ether"), but you could find other equivalents...
As i said, i have no experience with this and can't tell you if the results will be the same!
NOTE: Umm, i see that P9641 hasn't listed great quality controls. Same site, but FLuka 74154, seems a bit more extensive on this... I'd say, take a look at other companies too, and find the product that best fits the quality controls of your Lubrol PX...