Honda GX25 Owner's Manual page 6

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Use Honda 4-stroke, or an equivalent high detergent, premium
quality motor oil certified to meet or exceed U.S. automobile man-
ufacturer's requirements for service classification SG, SF. Motor
oils classified SG, SF will show this designation on the container.
SAE 10W-30 is recommended for general, all temperature use.
MULTI VISCOSITY
Ambient temperature
Using nondetergent oil or 2-stroke engine oil could shorten the
engine's service life.
Standard/Tiller type:
The recommended operating range of this engine is 5 °C to
40 °C (23 °F to 104 °F).
Pump type:
The recommended operating range of this engine is 5 °C to 40 °C
(41 °F to 104 °F).
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