yes I know what it is - and I have a few freind working as mechanics in toyota dealerships where the scion version are serviced - unless you are booting the engine 95% of the time - any oil with above 10 cst viscosity at 100C actually slows down flow to the crank, it was a sort of literature that was given by toyota. and the engine still floods the oil with fuel, let it warm up to clean itself.
Similar literature is also for the 2GR-FE and 1GR-FE engines.