I've read plenty about them and they don't save as much power and fuel as people who haven't read up on them would think. Run the pumping HP equations yourself and you'll see they are not some miracle fuel saving device, especially at lower RPM (less than 2500) where engines live most of their life. In order to save pumping HP and save fuel, the oil flow volume needs to be cut back. You can only cut it back so far before causing lack of lubrication problems.
Cutting the flow back from say 3 GPM at 2500 RPM to 1.5 GPM, and assuming both flows are at the same pressure of 25 PSI due to a change in the oiling system design, the pumping HP loss savings at those conditions (if pump was 70% efficient) would only be 23 watts - miniscule.
Of course they work differently. They may not be "under designed" but if they cut oil flow then they are operating closer to the under designed limit - that's my point. That's why I'd rather have a bit "too much" flow vs not. The whole purpose of a variable flow pump is to reduce flow to reduce pumping HP loss. Cutting flow too much isn't the best direction to go, so hopefully the engineers still left some buffer zone. But nobody is going to convince me that they are better at lubricating an engine and are the best thing ever invented for an ICE.
That’s a well made oil at any price … but it’s normal Walmart price !
