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You need to do some more reading on which manufacturers use 0w20 oil and what changes they have made to the engine/design. I have run 5w20 in my yaris for 8000km then went back to 5w30 synthetic and change oil and filter once a year [22,000km/yr] I am at 119,000km on the odometer without problems. I dought that a change to 0w20 oil will amount to much in fuel savings. I would recomend you learn some hypermiling techniques, and you will get way better results than a change in oil.
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