The most important thing about oil is to add ZDDP. That is the chemical that has been taken out of motor oils because is was supposedly contaminating the planet. ZDDP protects older engines that have not been upgraded with hardened valve seats.

If your engine is original and has not been rebuilt (specifically hardened seats) then you should ALWAYS be adding ZDDP with each oil change.

Regarding oil brands or products to use, everyone will have their opinion. Personally I have stuck with Valvoline (non synthetic) my entire driving life and have never had an oil related issue in any vehicle I have owned. Others use racing oil, others use synthetic, the list goes on and on.

As far as storage, the 50 degrees (hopefully dry, not humid) sounds great. If you have a way to start and run the vehicle once a month and bring her up to operating temperature, you will have a whole lot less issues with seals drying up and leaking.

I also put a dose of sea foam in with the last couple of fill ups for the season. And NEVER use ethanol fuel for over winter storage. (never use it if at all possible all year round)