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Two-stage Oil

 Dual viscosity immiscible oil
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(+2) 		  [vote for,
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Proposed is a dual-viscosity oil consisting of two partially immiscible components. One component "A" has a high mass density and a low viscosity. A second component "B" has a lower mass density and a higher viscosity. When the engine is cold, fluid "A" rests on the bottom and covers the pump siphon tube. Fluid "B" floats above fluid "A". On startup, fluid "A" travels into the oil pump and quickly circulates in the engine. A few seconds later, fluid "B" is mixed with fluid "A" in a quasi-equilibrium state while the engine is running. This setup prevents metal-to-metal contact by achieving a high flow rate at startup and a high load capacity when the engine is warm.
—kevinthenerd, Apr 19 2012

Two-stroke Oil http://en.wikipedia...wiki/Two-stroke_oil
Mix your lubrication in with the fuel. [zen_tom, Apr 19 2012]

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       Isn't this what you do when you mix two-stroke oil with fuel in order to power smaller petrol engines? [edit] Actually no, rereading; I see there's a difference in having a dual-viscosity oil in the sump, and mixing it into the fuel.
—zen_tom, Apr 19 2012
   

       [+] You could switch to oil 'B' completely when the engine's warm.   

       I had thoughts like that: "powered" by having a vacuum in the crankcase while the engine's running: thin oil evaporates out (as well as blowby which is removed) and is sequestered separately until the engine cools down. Later when the engine's stopped, the thick oil congeals on the parts rather than dripping off and the thin oil is returned to the crankcase. So the startup lubrication consists of oil already on the parts and thin oil which moves around quickly.
—FlyingToaster, Apr 19 2012
   

       >I see there's a difference in having a dual-viscosity oil in the sump, and mixing it into the fuel.   

       I think you might be closer to the truth than you think, petrol has a very low viscosity.
—not_morrison_rm, Apr 22 2012
   

       This is interesting, but how do you check the oil level?I suppose the low density oil will be lost at a higher rate.
—Ling, Apr 23 2012
   

       Isn't this the principle behind existing blended motor oils, 10W-40 for instance, with added immiscibility of oils*?   

       *Difficult unless you've figured out a way to change the polarity of oil. A polar liquid will almost always be miscible with another polar liquid; a non-polar with a non-polar.
—UnaBubba, Apr 25 2012
   

       So, an emulsifier? No... seems it's more like a thixotropic agent, activated by temperature. Wow! Oil is a form of custard!
—UnaBubba, Apr 25 2012
   


 

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