The need to address oil out was introduced as a requirement in 1988, so it is reasonable to assume that most helos certified before that date do not meet the requirement, and have never been tested for oil out. I have searched the FAA archives, and found that the TCDS (official FAA source for certification basis) lists the below for oil failure qualification:
B412 NOT
S-76 NOT
AS-365 NOT
AW-139 YES
EC-155 YES
EC-225 YES
S-92 YES
Here is the requirement:
29.927 amendment 26, 10/3/1988:
c) Lubrication system failure. For lubrication systems required for proper operation of rotor drive systems, the following apply:
(1) Category A. Unless such failures are extremely remote, it must be shown by test that any failure which results in loss of lubricant in any normal use lubrication system will not prevent continued safe operation, although not necessarily without damage, at a torque and rotational speed prescribed by the applicant for continued flight, for at least 30 minutes after perception by the flightcrew of the lubrication system failure or loss of lubricant