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The type of oil that is recommended for Kohler engines is 10W-30 Command Oil. SAE 30 Magnum Oil is also recommended for certain Kohler engines.
If it has a Briggs and Stratton engine you need SAE30. If it is a Kohler it uses 10W30.
SAE 10w30. I recommend you use synthetic oil in any air cooled engine.
I am not sure what you are wanting to use the oil for. If it is for a lawn mower, most of them take either 10w30 or SAE 30. They are not the same oil. You will need to refer to your engine manufacturer for the oil required for your engine. Normally most Briggs and Stratton and Tecumseh engines use the SAE30 oil. While most Kohler engines use 10w30.
Common sense. Use the incorrect oil and you will damage the engine.
You can use any SAE certified engine oil in your Nissan. The engine oil should be a 10W-30 weight engine oil.
If it is smoking it is more than likely a blown head gasket. Common issue with this engine.
5w30
either SAE 30 OR 10W 30 OIL
That depends on the mower and engine. I have Cub Cadet rider with a 16 hp Kohler engine that does call for 10w30. A lot of others call for sae 30 only.
It is possible to use 4-stroke oil in a 2-stroke engine in an emergency situation. You should not use this oil in the long term as it will damage the engine.
You should use 327ci 300hp 1966 Corvette engine oil ;)