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My 07 RX is leased until 54K, so I use Mobile 5000 5W30 bought at walmart in the big 5Q jug for $9 and $2 extra for another quart since the car takes 6.4. I usually put in 6.2Q after an oil change.
In my Prius which I bought and will keep for awhile. I use Royal Purple 5W30 Synthetic. It uses real synthetic base oils unlike Mobil 1, so I switched.