I haven't had anything much to do with the Viper, but the Rolls Royce RB162 had a total loss oil system where all the oil was scavenged out to the exhaust.
The engine was the Boost Engine fitted to the Trident 3 and so wasn't in use all the time. I do remember checking the oil quantity on a gauge in the rear equipment bay and topping up from a remote re-oiling point close by.