I've had both. Current 520cid aluminum engine has the Preluber. Computer controled to pump
oil as long as you want during "dry" start up. And the same feature during shut down so the
oil left in the hot bearings does not cook. The shut down feature is mainly for the turbo guys, but makes sense to me. Can also program to come on at a low
oil preasure condition. This only works if you have a second pick up point in the oil pan, which I have.
Richard
Memphis