Look in the owners manual if you have it and see what the rating on the oil should be. I think most air cooled engines require a SG or SJ rating but I'm not sure. Air cooled engines run at higher temp than water cooled engines so, although automotive oils will work, if you're looking for long term service the proper rating will be best. Another thing you should do is run the engine at full throttle to keep the fan turning faster to cool the engine.
30 wt
Yes 10w30 is a good oil for snowblower or lawnmower.
Any straight 30 weight should do.
Most small engines use 30 weight non-detergent type.
If the wrong oil is used in a lawnmower, do not start it. Simply drain the oil as completely as possible and fill with the proper oil.
In moderate temperatures, as in a lawnmower used in summer, most will use straight 30W oil.
NO, not in any lawnmower made in the last 40 years. Use SAE 30 or SAE 10W30 detergent oil.
You must use the oil that the manufacturer recommends in the handbook.
Generally, 30W of SG or higher rating.
Most manufactures recommend SAE 10W30 or 30W. I recommend you use 10W30 Synthetic in any air cooled small engine.
yes yes
generally in a lawnmower you use straight gas. there should be oil in the crankcase for engine lubrication. check the owners manual for proper oil weight