OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines Engine oil for 4 stroke mowers.

The B & S manual says use SAE 30 above 10 degrees C, and 5W-20 or 5W-30 at lower temperatures. If not available at 10 C or more, use SAE 10W-30. In other words, ordinary engine oil is fine for Australian conditions.