No
10W30 can be used, but SAE30 is best. 10W30 can run a bit hot, in warmer climates.
If the recommended oil is SAE30 why would you use SAE 10W30? Some mowers recommend either of these weights but if your recommends 30W then using 10W30 will cause it to use oil.
If it has a Briggs and Stratton engine you need SAE30. If it is a Kohler it uses 10W30.
It is a little thick. You should use sae30 or 10w30 (on cold temperature)
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.
I dont know why you would want to do that. The multi viscosity and straight weight oils wont mix and the multi viscosity oil will be expended faster when it is at its low end. If they happen to reach the correct temperature together, they will flow as united and become the same weight but never be homogenous.
Briggs & Stratton small air cooled engines use SAE30 weight oil or SAE 10w30 if they will be operated in cold conditions. I highly recommend you use Synthetic oil in any air cooled engine.
There is no difference in viscosity. A 10w30 full synthetic is the same as a 10w30 blend.
In a cold engine, 10w30 is heavier; however, in a warm engine, both should be the same weight - 30.
Use exactly what Honda recommends and nothing else which is SAE 10w30 for general use. Using anything else may void your 7 year warranty. I recommend you use synthetic oil in any air cooled engine.
If the manufacturer of the lawnmower specifies only SAE 30 then do not use SAE 10W-30. However on most mowers you can use either weight. I highly recommend you use synthetic oil in any air cooled engine.
Not in any instance I can think of.