and I looked into it. What it does it actually only "pulses" (pumps the oil in short bursts) the oil instead of continuously flowing the oil, which ensures that the engine always has some oil in it. While this keeps oil in the engine, on cold starts, it is still better to have the oil flowing under pressure rather than relying on oil that is stationary. Most of the lubrication in an engine comes from oil moving under pressure. I am also not sure if I believe that it moves enough oil during a turbo cooldown to prevent coking, and also it definitely does not pressurize the system sufficiently to switch in the oil cooler. IMHO, I would pay the extra $200-$300; there is an obvious difference when the cardiolube takes half a day to excavate the oil in an oil change, while preluber takes 15mins.