Most professionals recommend that you use high octane gas. Like 92-94 octane.
30 wt
no get new gas
Any straight 30 weight should do.
There are number of different kinds of gas you should use. The gas you should use depends on the situation.
regular gas IS unleaded...
If your lawnmower stops working after five seconds of use, you may need gas. It can also be a problem with your fuse.
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
Regular gas should be fine
5w30
10W30 can be used, but SAE30 is best. 10W30 can run a bit hot, in warmer climates.
unleaded
You should use 93 Octane in your bike.