I personally own an Ariens 6hp 2 stage snowblower. It is approximately 35 years old and I inherited it from my Uncle 25 years ago.
I always use Mobil 1 engine oil (5w-30) for ease of starting. It is a manual pull-start.
I NEVER drain the gas out in the spring. I leave the tank approximately 1/2 full and fill it up with fresh gas in the fall. I use unleaded gas without alcohol.
I NEVER run it between snowfalls “to keep it in good shape” It may set for 3-4 weeks between each use.
It usually starts in the 1st to 3rd pull. Last fall, after being in storage for 9 months with the gas tank 1/2 full, it started on the first pull. On occasion, if I accidently flood it, I will remove the spark plug and give a very small shot of starting fluid into the cylinder. It then starts on the next pull.
So, in summary, unless your operators manual calls for running it on occasion, I don’t think it is necessary.