Toyota Tundra 2005 Owner's Manual page 440

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Engine oil selection
"Toyota Genuine Motor Oil" is used in
your Toyota vehicle. Use Toyota approved
"Toyota Genuine Motor Oil" or equivalent
to satisfy the following grade
viscosity.
Oil grade:
API grade SL "Energy- Conserving" or
ILSAC multigrade engine oil
Recommended viscosity:
SAE 5W- 30
Outside temperature
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'05 TUNDRA_U (L/O 0409)
SAE 5W- 30 is the best choice for good
fuel economy and good starting in cold
weather.
If SAE 5W- 30 is not available, SAE
and 10W- 30 may be used.
should be replaced with SAE 5W- 30 at
the next oil change.
However, it
API service symbol
ILSAC certification mark
2005 TUNDRA from Sep. '04 Prod. (OM34432U)
439