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What type of oil to use in transmission 1998 lawn mower?

The type of oil to use in a transmission of 1998 lawn mower will depend on the specific model of lawn mower. Generally, most lawn mower transmissions use a SAE 30 or SAE 10W-30 motor oil. It's important to refer to the owner's manual of the lawn mower to confirm the recommended oil type and viscosity.

SAE (Society of Automotive Engineers) classifies motor oils based on their viscosity, with lower numbers indicating thinner oils and higher numbers indicating thicker oils. For a 1998 lawn mower, SAE 30 is a relatively lightweight oil suitable for warm climates or summer conditions, while SAE 10W-30 is a multi-viscosity oil that provides better performance in colder temperatures and varying conditions.

Here are some additional tips for choosing the right oil for your lawn mower transmission:

• Refer to the owner's manual or consult with a qualified repair person to ensure you select the correct oil type.

• Avoid using automotive oils, as they may contain additives that can damage the transmission seals.

• If the transmission has a separate oil reservoir, make sure to fill it to the appropriate level indicated by the manufacturer.

• Regularly check the oil level and change the oil according to the maintenance schedule in the lawn mower's manual.