Yes, sae30w oil is what's recommened.
What kind of engine? lawnmower, car.
Yes
No it is far too heave for an air cooled engine i recommend 10W 30 or just a regular 4 stroke lawnmower oil
Not really sure what you're getting at. If your lawnmower engine is a 2-stroke then you need a mixture of oil and gas to run it.
what grade of oil on this engine
to put the oil in the lawnmower's crankcase would be fine, so long as it is an appropriate viscosity.
30 weight oil can use car oil or lawnmower oil same oil
I think it is a 2.5 horsepower engine. There are 4 oil formulas for Kawasaki lawnmower engines. I recommend you use the correct blend as stated in your owner's manual.
Automotive oil is identical to lawn mower oil. They are both internal combustion engines. I would however recommend you use 100% Synthetic oil in that air cooled lawnmower engine.
Yes you can but if you are using a 10W30 oil be sure it is synthetic or buy a straight grade SAE 30 Weight Oil. Why? A standard oil (non synthetic) 10W30 oil has too many VI improvers.. additives that will break down in an application such as a lawnmower and cause the oil to no longer be a 30 weight oil. It will quickly become a 20 Weight SAE oil that will no longer protect the engine. A synthetic 10W30 Small Engine oil does not have any of these VI improvers to break down and cause the oil to lose it's viscosity rating. Basically.. do not use a standard 10W30 Car oil for your lawnmower.
You get engine damage from lack of lubrication
NO, not as lubrication in the crankcase.