Originally Posted By: slalom44
Originally Posted By: Oilgal
Pre oilers, aka oil pre chargers, eliminate cold starts. They inject oil directly into wear surfaces, bearings rings etc, before the engine starts, when you turn the key.
I have a prelube pump and a bypass filter installed in my car, and I have very low wear metals. I use Amsoil 0W-30 oil. I'm convinced that the prelube pump gives you Hydrodynamic Lubrication from the very first rotation of the engine. The preluber doesn't just lube all of the surfaces, it also pre-pressurizes the entire system so that your oil light is off before you crank the engine.
When people say that have immediate or instant oil pressure without prelube, they're guesstimating. Your oil light stays on for varying amounts of time, and just because you can see the oil start squirting right away, doesn't mean that you have hydrodynamic lubrication with the first rotation of the engine.
Here is my UOA:
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1064707&fpart=1
I have been using a pre-luber for an 88 E-150 for about 20 years. Its a pump I mounted under the hood, with a dash mounted toggle switch which I turn on every time I start the van. As it pumps I watch the oil gauge build pressure. When I have pressure I start the engine.
Prior to using Synthetic oil I observed how long it took to build pressure Dino oil takes more than twice the time to build pressure than the synthetic oil (cold morning 20*, if colder it takes even longer). That pretty much sold me on the synthetic oil.
Nice feature of the pre-luber is after a long run in hot weather I can turn it on after I shut the engine off and use oil to help cool the engine. If I store the van for long periods of time during the winter months I can go into the garage turn the pump on and let it run for a minute or so and circulate oil w/o starting the engine. Nothing is going to totally eliminate wear, but things like the pre-luber certainly help. Biggest problem with newer cars is where to mount it!
Frank D