what are y'all thoughts on 0w-8 motor oil?

Toyota had this viscosity recommended for certain engines before it was actually approved. Nothing wrong with a thinner viscosity if the engine is designed for it. You'll get better fuel economy to. Imo, use the viscosity oil recommended in your owners manual...they built the engine.
 
wouldn't this thin oil just start weeping from the seals as the engine heats and or ages
 
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