Blood is mostly made up of water, as are our organs and muscles. To read specifically about edema, swelling caused by fluid retention where excess fluid is trapped in the body's tissues, see our article Edema: Causes, Symptoms and Treatments.
If you use the Amsoil Ea15K01 and the ASM oil (For 3rd gen Prius), then you can safely go 15,000 miles between oil changes. I drive 25,000 miles per year in my Prius. Amsoil backs up their products by a written warranty.
Consider how this applies to service intervals. If the manufacturer recommends an oil change every 10,000km, then an oil change every 8,000km would comply to the cheap insurance argument. Servicing only slightly more often doesnât cost much more. What about, once you decide to change the oil every 8,000km, you discover that itâs now only a small incremental price increase to change the oil every 6,000km.