Where I live I need a block heater but I don't have one...

Multi-viscosity oil is intended for COLD temperatures that can make oil the consistency of molasses. Once the engine is at temperature, it is around 200 degrees. The oil will be at a similar temperature. When you start a "cold" engine at 114* ambient temperature, the viscosity of the oil is just fine and is cooler than it'* normal operating temperature. I don't understand why you would want to change to a higher viscosity. Just because cold ambient temps suggest lower viscosity DOESN'T mean hot ambient temps suggest higher viscosity oil.

I agree.

Just use 10W-30, Mobil1 recommended and you'll be fine.

If you don't need a multigrade oil you are better to use a single grade. Again I would recommend straight 30 weight or even 40 weight oil.
The additives will last longer and it is much more stable than 10W30 multigrade oil.

Manufacturers will always specify multigrade cause they are catering to warranties and cars in different climates.

Thanks for everyones help, I got some Penzoil Platium 10w-30

I feel dumb now. So that is what the w means, & I wouldnt need it in Puerto Rico. Why would they eaven sell those here?

They sell it there because the distributors sell oil in massive volumes and the 10W30 blend is the most common. The straight grade oils like 30 weight or 40 weight are not as common and are sold in smaller volumes so there is not as much profit in it for them.
It'* all about money.

I have had many discussions with Exxon reps and they believe the 0W30 or 0W40 blends to be superior for really cold climates.

I use straight 30 weight in my lawnmower. With less additives and a simpler molecular composition, it will be stable longer requiring less frequent changes and offer better protection.