0w-30 should be a safe replacement for 5w-30, and should increase efficiency in cold weather and short trips. Going thinner on the higher number might be OK, but an oil analysis might be a good idea to check for excess wear.
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2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro
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