Lexus 2008 IS250 Owner's Manual page 295

Recommended viscosity
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Outside temperature
How to read oil container labels
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Some oil containers are labeled with ILSAC certification marks that
help you to select the proper oil.
4-3. Do-it-yourself maintenance
SAE 5W-30 is the best choice for
good fuel economy, and good
starting in cold weather.
*: If SAE 5W-30 oil is not avail-
able, SAE 10W-30 oil may be
used. However, it should be
replaced with SAE 5W-30 at
the next oil change.
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