Yes,
My 2001 Ram got the Preluber at 7929 miles and Amsoil Bypass filter set up in July 2000 with 9150 miles and have not changed oil since. Truck now has only 56K on it with olly filter changes and good analysis reports I hope to go 75K before oil change. I do like the preluber, just not the cost.
I installed my first one (I bought in 89') on my 93 Dakota, Loved it as at the time I did not know any better and Used Fram oil filters on a remote location (easy access) and Valvoline motor oil. Changed it religiously every 3,000 Miles for 189K miles until I traded (gave away) truck for new ram. I was getting too scared pulling Car hauler and car behind Dakota on highway above 55 MPH so I needed the RAM bad. I just heard the other day from my best friend that my old truck is still on the road and running, three years later it must be about 240-250K miles on it now, so I know the preluber did help the old 5. 2 L.
Issues that I had, original design from late 80's had a 2" motor that sucked many amps, I would blow 30A fuse in winter when very cold if I cranked motor during the first 30 seconds it ran. After 70 K miles on Dakota, I need to call preluber and get new brushes for it. They no longer made that model and sent me a hole new motor that was 2. 5" in diameter, so I pulled it apart and modified brushs to fit. Ran OK from there out.
The model on my 2001 Ram is a much smaller unit, metal motor and a brass pump housing. So far no problems when cold, but with warm motor oil there are just too many orifices, bearings, Turbo, on the Cummings for it to keep up with and indicate a pressure on factory gage. It still is moving a lot of oil, About 5 quarts in 60 seconds, just not enough to build pressure when motor is hot.
Also, the push-lock fittings all weep a little oil, but so far never enough to drip on driveway, just makes a mesh on the hoses. The hoses have done this on all three installs I have done, I even upgraded to a better fire sleeve push lock on my 01 and didn't use the hose they provided.
I am looking at upgrading to an 04 Ram this fall, the only thing I would do different is to use fittings like the Amsoil By-pass filter set up has. They are true hydraulic lines that you cut to length, and install hose ends on, Rated to 2500 PSI and tighten with swivel nut on ANSI fitting. They don't leak at all.
It's not just a preluber, mine is on minimum setting, 30 seconds on start up and 60 seconds on shut down. After letting truck idle a minute, I love to shut it off and walk away and let everyone look at my truck trying to figure out what that noise is for the next minute while it cools the turbo. I usually don't have time to provide and adequate answer, so I say it is an electric oil pump for such a powerful engine. Then drive away with turbo singing out the straight pipe, and transmission trying to keep up.
Good Luck, Don