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The Toyota Prius 2007 Owner Manual states that the recommended oil viscosity is SAE 5W-30 when the outside temperatures is between -18°C and +27°C:

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What's the recommended oil viscosity when the outside temperature is higher than 27°C? The summer weather at my location gets pretty warm.

Franck Dernoncourt
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1 Answers1

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As I wrote about in this post, here is a chart which covers the different weights:

Image of oil viscosities versus temperature

You do want to follow your manufacturer's recommended oil specification, though. Using the wrong oil can cause engine damage over the long haul.

Pᴀᴜʟsᴛᴇʀ2
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